Torso
Like the neck, the equine spine has both a specialized structure and articulations specific to the genus. Contrary to belief, however, the equine back isn't a pliable rod; it cannot flex freely in any direction, and it cannot flex evenly, like a curve (as we so often mistakenly see in books). In reality, the torso is quite rigid due to evolutionary requirements tailored to a large herbivore dependent on running in a straight line for extended periods for escape. It's an evolutionary thing. [Note: The spine should really be interpreted as a whole unit, to include the neck and tail as well as the torso since it acts as a whole, interconnected system.]
Curiously, the torso is typically treated as an afterthought as though it was an inert means to connect the forequarter to the hindquarter. However, the torso is dynamic and full of articulating expression and reactive and pro-active movements despite its relative rigidity. How the torso manifests is also a function of emotion as an anxious mind will stiffen the torso while a relaxed mind will make the torso more supple. So we need to pay close attention to its bends, twists, stretches, tilting, compressions, hollowing, dips, tension and relaxation, and rounding when interpreting motion, posture, balance, and expression.
We should know, too, that all motion starts in the spine, and is dictated by the spine. That's to say its the oscillations of the spine that determine the gaits and leg movements, making the torso as important as the legs for expressing movement in our clay. Subsequently (and grossly oversimplified), an equine back...
- Is capable of approximately 2 1/4 inches of dorsiflexion.
- Has the greatest potential for lateral bend between T9 and T16.
- Has a lumbar region largely inflexible for lateral bending and limited rotational movement being designed instead for “coiling." However, there's a tiny snidge of lateral flexion possible between L1 and L5.
- Has a fused sacrum capable only of coiling at the lumbo-sacral joint (LS-joint).
- Is capable of a relatively goodly degree of cumulative rotation; transversal rotation occurs mostly between T9 and T14.
- Can stretch to elongate the body.
- Can compress to shorten the body.
- The ribcage can be shoved outside a curve to "bank a turn."
- Has ribs that articulate in and out, and fore and aft when breathing.
- The spine is built on a soft arch to support the viscera not on a straight line, as so often misrepresented in anatomy books.
So, in shorthand, this means that...
- The horse cannot bend laterally in a gradual curve but more as a series of specific kinks. That's because most bend occurs between T9 and T16 while he "banks a turn" by pushing his ribcage outside of the bend to bring his hindfeet under himself more. Then add in the curve of the neck and the tail. Kink-kink-kink-kink.
- The torso makes countless adjustments to accommodate balance, motion, emotion, and posture.
- The greatest degree of articulation occurs at the LS-joint.
- The barrel swings over the supporting hindleg in reaction to the physics of motion.
- All movement begins in the spine, not the legs.
- The torso can rotate the forequarter in relation to the hindquarter quite a bit, as often seen in cutting horses.
- The torso elongates or compresses depending on motion, balance, emotion, and posture.
- The torso expresses anxiety or relaxation depending on the store tension or suppleness.
- When the neck is raised high this tends to hollow the back just a bit. Conversely, when the head is lowered, the back rises.
Being so complicated then, and so typically overlooked, the equine spine is a common place for anatomical errors, most often being:
- Structural asymmetries.
- Skeletal alignments, topography, and landmarks in error.
- Incorrect topography of the musculature, often inconsistent with the depicted motion.
- Articulations incorrectly moving or constructed.
- Muscle action inconsistent to the action or movement.
- Incorrect planes.
- Incorrect placement of features, typically of landmarks and muscle groups.
- Incorrect proportion.
- A lack of secondary sex characteristics.
- Inadequate age morphology.
- A lack of texture and detail.
- Withers that ride up onto the neck, sometimes even in front of the scapular cartilage.
- Narrow or flat ribcages.
- Ribcages not of the correct shape, often being tube-like. Instead, the equine ribcage is shaped like a canoe with a keel between the forelimbs and a wide, flat bottom towards the groin. However, each horse and even breed has a slightly different shape to their ribcage so we shouldn't sculpt it with a formula or habitual approach.
- Static ribcages that aren't manipulated to accommodate motion, posture, or balance.
- Static torsos that don't reflect motion, posture, or balance, or spinal movement that's misinterpreted or inconsistent to the depicted motion, posture, or balance.
- Static torsos that don't reflect emotion.
- Forgetting that all motion begins in the spine and not the legs, so neglecting to factor in torso qualities when design a composition.
- Forgetting how the spine moves. For instance, it often bends when turning, rounds in collection, hollows in a halter stretch, and rotates in certain motions like cutting, as well as making myriad continual adjustments. It's definitely not a static component of the body!
- Forgetting the effects of "moment," and cause and effect when it comes to articulations, balance, posture, emotion, flesh, and physics.
- Physics being ignored or not adequately factored in enough.
- Spines bending and moving in too flexible a fashion, like a cat or dog.
- The spine of a halter stretch sculpture not hollowed out, but in the standing orientation.
- A coiled position of the body without a rounded spine.
- Collection of the neck, head, and legs without bascule through the spine.
- Crooked spines.
- Spines that don't bisect the body.
- A spine that kinks at the loins.
- Crooked sternums.
- Inconsistently placed ribs.
- Out of scale features.
- Incorrectly sculpted genitalia, or genitalia that's out of scale, or lacks the necessary fleshy texture.
- Genitalia that don't synch with motion.
- No barrel swing out over the supporting hind leg, in synch with the spine and the momentum of motion, often referred to as “schwung” in German.
- Formulaic musculature when, in reality, flesh morphs with motion, posture, balance, emotion, physics, and "moment," distorting away from the contrived order of an anatomy chart. Horses don’t move like jointed anatomical paper dolls.
Pelvis
The pelvis is a fused girdle of bone lashed onto the spine at the sacroiliac joint by a tight network of ligaments. Functioning as a solid unit, the pelvis moves in sympathy with the spine; whatever the spine does, so must the pelvic girdle. The reference points of the pelvis are the ichium (point of buttock), tuber sacrale (point of croup) and the tuber coxae (point of hip). Neither can the pelvis internally articulate nor articulate with the spine. It can only articulate with the LS-joint, or sacrum. Consequently, these reference points are always parallel and aligned to each other as a perfect box and always bisected by the spine, regardless of movement, posture, balance, or emotion. Yet many artists seem to forget these anatomical parameters, and so commonly sculpt errors such as:
- Structural asymmetries, which means the pelvic girdle itself is broken, or broken off the spine. The points of buttock, points of croup, and points of hip should always form a perfect box centered on the spine, regardless of motion.
- Asymmetrical placement of the femoral joints.
- Skeletal alignments, topography, and landmarks in error.
- Incorrect action or topography of the musculature, often inconsistent with the depicted motion.
- Incorrect planes.
- Incorrect placement of features, typically of landmarks and muscle groups.
- Incorrect proportion.
- A lack of secondary sex characteristics.
- Inadequate age morphology.
- Pelvic girdles askew on the spine, not bisected by the spine.
- An ichium out of alignment with the tuber sacrale, tuber coxae, and the femoral joint.
- Tuber coxae that are collapsed, making the points of hip too narrow in comparison to the tuber sacrale and the ichium.
- "Pinched" ichium.
- Misplaced femoral joint.
- Forgetting the effects of "moment," and cause and effect when it comes to articulations, balance, posture, emotion, flesh, and physics.
- Forgetting pelvic motion in movement, treating it like a static, inert block.
- A pelvic girdle that doesn't "follow the legs to the ground." For example, if one hindlimb is cocked in a resting state, the pelvis should tip down on that side; otherwise that hindlimb ends up being longer than its pair.
- Ignoring the LS-joint in motion, posture, balance, and emotion.
- A narrow pelvic girdle. It should be the same or slightly greater width as the shoulders.
- Out of scale features.
- A lack of texture and detail.
- A pelvic girdle inconsistent to the articulations of the spine.
- Physics being ignored or not adequately factored in enough.
- Formulaic musculature when, in reality, flesh morphs with motion, posture, balance, emotion, physics, and "moment," distorting away from the contrived order of an anatomy chart. Horses don’t move like jointed anatomical paper dolls.
Forelimb
The forelimb includes the scapula, humerus, radius, ulna, carpals, metacarpal, the pastern bones, the sesamoids, the navicular, and foot. The entire thing operates as a symbiotic whole through a pulley-system of tendons and ligaments, tensionally balanced like a drafting lamp. Nothing operates independently. So that means all foreleg movement is dictated by the scapula and activated through the tendinous and ligamentary pulley-system. In fact, no muscle exists at or distal to the knee since they morph into tendons that act on the lower leg. Therefore, lower leg motion is governed by the muscles of the forearm through the humerus and down from the scapula. So whatever the hoof is doing is a reflection of what the knee, elbow, and shoulder are doing. Only if weighted, fatigued, uncommonly stressed, or injured do variations occur.
The scapula (shoulder blade) is not attached to the torso by bone, but by a sling of muscles and flesh referred to as the "Shoulder Sling." As a result, its motion is a sliding one and is remarkably supple, fluid, and dynamic. It also acts as a shock absorber and so forelegs can "jam into" the shoulder under the forces of impact. The scapula can also rotate and pooch just a bit though, as seen when the horse lays down.
The scapulo-humeral joint (between the scapula and the humerus) has a tremendous potential range of movement. However, a tight network of ligaments and muscles restrict the full potential of this joint. Nevertheless, it has a significant influence on foreleg motion. For example, it can flex and extend as well as cause foreleg abduction, adduction, and rotation.
The humeral-radial joint (between the humerus and radius), or elbow, is a strict hinge joint capable only of flexion and extension along the sagittal plane. It cannot laterally or medially bend, or rotate. Acting like a lever, the ulna (elbow) is fused to the radius (forearm) and therefore acts as an extension of it.
The carpus (knee) is a hinge joint. However, it's capable of some shifting and twisting in flexion, clearly seen on reclining, high-stepping, or jumping horses, or when the hoof wings out. The carpus is also a dual-hinge joint, having a 2-tier construction. That said, the carpus can only articulate at the joints between the radius and the 1st layer, and between the 1st and the 2nd layer. The 2nd layer is so tightly lashed with ligaments onto the metacarpal (cannon) that it cannot articulate whatsoever, making it an extension of the metacarpal.
The three points of articulation in the foot are the fetlock, pastern, and the coffin joint (or pedal joint). All three are hinge joints, but the pastern and especially the coffin joint can produce some shift, lateral bend, and rotation. This can be easily seen on reclining horses, hoof "wobbling" during extreme movement, or laterally or medially angled pastern bones when the hoof is planted on the ground. The sesamoids, though firmly attached by ligaments to the 1st phalanx, articulate slightly with the cannon during flexion. There's also the navicular bone that articulates with the coffin bone and 2nd phalanx.
The forelimb is a complex structure with equally complex movement parameters. It's no surprise then that these common errors occur:
- Structural asymmetries.
- Skeletal alignments, topography, and landmarks in error.
- Incorrect topography of the musculature, often inconsistent with the depicted motion.
- Bones and joints lacking their characteristic boney, tendinous, and ligamentary landmarks, topography, tuberosities, and details. Puffy, indistinct, rounded joints are a common error.
- Joints the wrong shape.
- Muscle action inconsistent to the action or movement.
- Articulations incorrectly moving or constructed, or with joints oddly distorted.
- Legs with warps, twists, and distortions, such as “spaghetti legs."
- Incorrect planes.
- Incorrect placement of features, typically of muscles, landmarks, and ligamentous or tendinous groups.
- Incorrect proportion.
- Inadequate age morphology.
- Bent or undulating long bones.
- Points of shoulder too extreme or displaced as to distort the shape of the shoulders.
- Forgetting the effects of "moment," and cause and effect when it comes to articulations, balance, posture, emotion, flesh, and physics.
- Forelimb motion that doesn't originate with the scapula.
- A missing or displaced Pisiform.
- Not factoring in emotion when designing leg articulation. Relaxed or lazy horses often have plodding, dragging motion whereas excited or anxious horses usually have snappy, quick motion.
- Forelimbs not articulating as integrated systems, like drafting lamps, having a ruptured pulley-system. For instance, standing shoulders with articulated forelegs, or articulated knees with extended elbows. However, also included are articulations that are inconsistent with each other such as a forelimb with a moderately bent scapula, extremely bent elbow, and slightly bent fetlock.
- Knees articulating in the wrong location, at the joint between the second layer of metacarpals and the cannon when, in life, a tight network of ligaments binds this intersection into an immovable joint. This is why the top of a bent knee is pointy and the bottom bend is rounded.
- Lacking splint bones, or splint bones of the wrong construction or location.
- Out of scale features.
- Formulaic musculature when, in reality, flesh morphs with motion, posture, balance, emotion, physics, and "moment," distorting away from the contrived order of an anatomy chart. Horses don’t move like jointed anatomical paper dolls.
- Static shoulders that lack their characteristic fluid motion. Always remember that there exists no bony attachment between the shoulders and the torso, but only the fleshy, stretchable "Shoulder Sling."
- A lack of texture and detail.
- The "button" of the point of shoulder in the wrong location.
- Lateral, medial, or rotation motion at the elbow.
- Bent ulnas, or broken elbows.
Chest
The equine chest is a changeable thing, thanks to the Shoulder Sling of the forelimb. Poor condition can make the chest narrow and emaciated while weighted forefeet can build up the chest musculature to become broad and bull-doggy. This makes the chest a tricky thing to measure proportionally, and so building a solid mental library of options is necessary to adequately gauge its width. Also complicating matters are the scapulae which move independently of each other and so distort the chest as a result. For these reasons, some common errors include:
- Structural asymmetries.
- Skeletal alignments, topography, and landmarks in error.
- Incorrect topography of the musculature, often inconsistent with the depicted motion.
- Forelimb articulations incorrectly moving or constructed as to negative impact the chest's construction.
- Incorrect planes.
- Incorrect placement of features, typically of landmarks and muscle groups.
- Incorrect proportion.
- Inadequate age morphology.
- Forgetting the effects of "moment," and cause and effect when it comes to flesh, articulations, balance, posture, emotion, and physics.
- Physics being ignored or not adequately factored in enough.
- Formulaic musculature when, in reality, flesh morphs with motion, posture, balance, emotion, physics, and "moment," distorting away from the contrived order of an anatomy chart. Horses don’t move like jointed anatomical paper dolls. And, in particular, chest musculature is prone to some pretty serious morphing; the options are almost limitless! For example, a lack of hollowing, bulging, distortion, stretching, pooching, striations, and other eccentricities so characteristic of the chest in motion, posture, or balance.
- Sculpting chests the same way on each piece, regardless of individuality, motion, condition, balance, or posture. Chests vary a lot!
- Sculpting a chest too square in shape; chests are either rounded, oval, or diamond-shaped.
- A chest not narrowing and compressing when the forelimbs are adducted, or not widened and stretched when the forelimbs are abducted.
- The "buttons" of the Panniculus moving independently of each other.
- The "buttons" of the Panniculus separated from the top of the sternum.
- A crooked sternum.
- Out of scale features.
- A neck tying into the chest too high or too low; it should be right above the "buttons" of the Panniculus which lay between the points of shoulder.
- An emaciated chest inconsistent to the condition of the rest of the body, or conversely, a built-up chest inconsistent to the poor condition of the rest of the body.
- Muscle action inconsistent to the action or movement.
- A lack of texture and detail.
Hindlimb
The hindlimb includes the femur, tibia, fibula, tarsus, metatarsus, pastern bones, sesamoids, the navicular, and foot. It's also governed by its own pulley-system subject to the same mechanical concepts as discussed for the forelimb. For this reason, the hindlimb also acts as a symbiotic, tensionally-balanced system, connected together and behaving like a drafting lamp. Again, no portion articulates independently. That means that hindlimb action starts with the femur then down through the leg to the toe. Now sometimes we can include the pelvis with the hindlimb, and in many ways this can be a better interpretation by allowing us to see the connection to the LS-joint and spine. But for simplicity, we've regarded the pelvis as its own "thing" in this discussion.
Anyway, the pelvic-femoral joint (between the femur and pelvis) is a ball and socket joint capable of a wide degree of motion. All hindlimb motion originates at this joint, making it essentially the shoulder equivalent of the hindquarter.
The stifle is actually comprised of two hinge joints, the femorotibial joint (between the femur and the tibia) and the femoropatellar joint (between femur and patella). And again, mirroring the foreleg (in this case the humeral-radial joint), both are hinge joints, incapable of lateral or medial articulation. However, a small degree of rotational motion can happen, especially when the hindlimb is extended backwards, rotating the toe slightly towards the median. The patella, a locking mechanism in the Stay Apparatus, articulates with the femur by sliding in sympathy with the tibia. In short then, the patella slides down when the hindlimb is flexed and up when the hindlimb is extended, maintaining approximately the same distance with the tuberosity of the tibia. Another important motion to notice is that the stifle must pop out around the wide ribcage in flexion, causing the entire leg to rotate outwards and slant inwards towards the median. Study the relationship of the stifle with the gaskin during motion, best observed from the front or rear, for clarification.
The tarsus (hock) shares two similarities with the carpus (knee). First, it consists of a 2-tier arrangement. And, second, the 2nd layer is tightly bound to the metatarsal (hindcannon), making this layer a mechanical extension of the metatarsal, an immoveable joint. But unlike the carpus, the rest of the bones of the tarsus are so lashed together by ligaments they are essentially fused together. As a result, the only point of articulation is between the astragalus and the tibia, the tibio-tarsal joint. Three important details to note here are:
- The point of articulation is on top of the hock.
- The calcaneum (the point of hock) leverages with the metatarsal like the ulna with the radius.
- The hock joint has a spiral construction due to the spiral articular surface of the astragalus.
This means the hock articulates at the top, and the calcaneum always remains in line with the metatarsal. Furthermore, the spiral construction of the hock joint causes the metatarsal to rotate inwards, counterclockwise for the left hock and clockwise for the right hock (when seen from the front), and on a straighter forwards orientation in preparation for impact. This causes those curious orientations of the hindlimb parts when it's tightly flexed such as we see on racehorses, Hackneys, Saddlebreds, and jumping horses.
It's no surprise then that errors are common with the hindlimb owning to its complexity. Some of the most common mistakes are:
- Structural asymmetries.
- Skeletal alignments, topography, and landmarks in error.
- Incorrect topography of the musculature, often inconsistent with the depicted motion.
- Bones and joints lacking their characteristic boney and ligamentary landmarks, topography, tuberosities, and details. Puffy, indistinct, rounded joints are a common error.
- Muscle action inconsistent to the action or movement.
- Ruptured pulley-system of the Stay Apparatus and Reciprocal Apparatus. Hindlimbs not articulating as integrated systems, like drafting lamps. For instance, a hindlimb with a broken Reciprocal Apparatus or Stay Apparatus. Other examples are standing stifles with articulated hind legs, or articulated hocks with extended stifles. However, also included are articulations that inconsistent with each other such as a hindlimb with a moderately bent stifle, extremely bent hock, and slightly bent fetlock.
- When articulated, joints are often oddly distorted.
- Legs with warps, twists, and distortions, such as “spaghetti legs."
- Bent long bones.
- Articulations incorrectly moving or constructed, or with joints oddly distorted.
- Incorrect planes.
- Incorrect placement of features, typically of landmarks and muscle groups.
- Incorrect proportion.
- Inadequate age morphology.
- Lacking splint bones, or splint bones of the wrong construction or location.
- Out of scale features.
- Forgetting the effects of "moment," and cause and effect when it comes to articulations, balance, posture, emotion, flesh, and physics.
- A lack of texture and detail.
- Joints the wrong shape.
- Hindlimb motion that doesn't originate at the femoral joint.
- Hocks articulating in the wrong location, at the joint between the second layer of metatarsals and the cannon when, in life, a tight network of ligaments binds this intersection into an immovable joint.
- A hock that's too pointy or flat, lacking the rounded, bulbous "cap" at the point of hock.
- A broken hock with a calcaneum that doesn't function as an extension of the metatarsal.
- Formulaic musculature when, in reality, flesh morphs with motion, posture, balance, emotion, physics, and "moment," distorting away from the contrived order of an anatomy chart. Horses don’t move like jointed anatomical paper dolls.
- Static femurs that lack their characteristic wide range of motion.
- The convergence of muscles groups on the femoral trochanter is misinterpreted.
- A lack of spiral motion of the hock joint.
- Hind leg articulation that doesn't factor in the "stifle-popping" effect to instead move on a straightforward plane from stifle to hoof, or worse, an articulated hind leg with a hock angled away from the median. In life, the stifle pops out around the barrel, angling the hock inwards and rotating it outwards while the hock’s spiral joint rotates hind cannon into a more-forwards position, keeping it from pointing out on the same plane as the popped-out stifle. The more extreme the hind leg articulation, the more pronounced these effects.
Foot
Now as for foot motion of either the forelimb or hindlimb
—specifically the fetlock, pastern, sesamoids, navicular, and coffin joints
—they're governed both by the pulley-systems of the limbs, but they can also be influenced by physics despite the pulley-systems. Their articulation should be consistent to the articulation of rest of the pulley-system since the toes are governed by the scapula and femur, respectively. However, that said, a foot may snap or wobble under the forces of thrust or inertia, often seen in racing or jumping. Or a slacken, floppy foot can be influenced greatly by inertia, thrust, and gravity, as often seen in the forefoot. Fatigue may alter foot motion, too. So we need to study foot movement not only in relation to anatomy, but also as influenced by motion, physics, emotion, and circumstance to gain a better understanding of these peculiarities. And referring to quality reference photos is always a wise practice!
Nevertheless, when it comes to foot motion, there're a few concepts to keep in mind:
- Most flexion tends to occur at the fetlock joint though the pastern and coffin joints play their role, too. However, coffin joint flexion becomes significant when articulation is extreme. Nevertheless, situations are variable. For example, primary flexion at the pastern and coffin joints may occur in the hindlimb when it's well under the body for support, often seen in haute ecole.
- In a correct foot, the top of the hoof capsule is oriented at or below the anterior tip of the coffin bone, meaning that the coffin joint isn't encased and inert inside a hoof capsule. This gives the foot a wider range of motion. In contrast, a pathological foot has a hoof capsule oriented above this point, encasing the coffin joint inside the hoof capsule and reducing the foot's range of motion.
- When a standing leg is extended backwards, such as a forelimb angled under the torso or a hindlimb angled out from under the body, the pulley-system straightens out the foot joints leaving the pedal joint to keep the foot flat on the ground. In other words, the pastern bones don't angle more to place that hoof flat on the ground, a common error in sculpture.
- The emotions of the horse can influence foot movement. For instance, a lazy or relaxed horse may exhibit floppy, slackened foot articulation whereas an excited animal may produce tight, snappy action. In this way, foot articulation can be an indicator of mood.
Despite how complicated and important the foot system is, it's often treated as an afterthought when it comes to leg articulation in sculpture. For example, common errors include:
- Structural asymmetries.
- Skeletal alignments, topography, and landmarks in error.
- Incorrect topography of the tendons and ligaments, often inconsistent with the depicted motion.
- Pathological foot structure.
- Articulation inconsistent to the action or movement.
- Forgetting to infuse physics, posture, balance, inertia, or emotion into foot articulations.
- Lacking the characteristic boney and ligamentary landmarks and details.
- When articulated, joints are oddly distorted.
- Incorrectly shaped joints.
- Portions with warps, twists, and distortions.
- Articulations incorrectly moving or constructed.
- Incorrect planes.
- Incorrect placement of features, typically of landmarks and ligamentary and tendinous groups.
- Incorrect proportion.
- Inadequate age morphology; the foot bones on foals are markedly different from adults.
- Unsculpted palmar feet.
- Palmar feet sculpted with anatomical errors.
- Pasterns that lack a bell-shape when seen from the front.
- Underdeveloped lateral cartilages.
- No hollow between the lateral cartilages.
- Forgetting the effects of "moment," and cause and effect when it comes to flesh, articulation, balance, posture, emotion, and physics.
- A rounded coronet all around the foot. In life, the coronet is slightly rounded in front to flatten towards the heel.
- An undulating coronet band.
- Foot bones not articulating as integrated systems with the pulley-systems of the limbs.
- Out of scale features.
- Coffin joints that don't compensate for the angles of the limbs when standing.
- Lack of texture and detail.
Tail
The tail is a continuation of the spine and so should reflect its robust dimensions. The tail is also the most flexible part of the spine, able to assume many different configurations as we see with lively tail movement. Nevertheless, the tail is often treated haphazardly or like an afterthought, usually exhibiting these following errors:
- Structural asymmetries.
- Skeletal alignments, topography, and landmarks in error.
- Incorrect topography of the musculature, often inconsistent with the depicted motion.
- Lacking the underside groove between the musculature.
- Lacking the flattish surface on the underside to instead be an incorrect rounded tube.
- Crooked bony alignment.
- Articulations incorrectly moving or constructed.
- Incorrect planes.
- Incorrect placement of features, typically of landmarks and muscle groups.
- Incorrect proportion, often being too thin, too thick, too short, or too long.
- A tailbone that doesn't taper towards the tip.
- Forgetting the effects of "moment," and cause and effect when it comes to articulation, balance, posture, emotion, and physics.
- Tail motion not factored into the design of the motion, misinterpreted, or inconsistent to the depicted motion, or forgetting that tail motion is a reflection of spinal motion.
Muscles
Muscles form the bulk of the flesh we recreate in our sculpture and help to give the horse his characteristic shape. They also animate the skeleton, but can only contract. As such, muscles are typically laid out in complementary, opposing configurations. Equine muscles are also unique to the genus so we need to pay them careful attention.
Also included here is muscle quality insofar as "smooth bodied" versus "muscular" build. That is to say that certain breeds are characterized by "smooth muscle," being "smooth bodied." Examples are the Arabian, Saddlebred, Morgan, and many drafters. In contrast, some breeds have a higher degree of definition such as stock horses and racing Thoroughbreds. So we have to account for muscle quality in order to ensure an authentic rendition of a breed or type.
Nonetheless, being so complicated and intricate, they're often sculpted incorrectly such as:
- Structural asymmetries.
- Muscular alignments, topography, and landmarks in error.
- Incorrect topography of the musculature, often inconsistent with the depicted motion.
- Not accounting for resting tonus. For example, Arabians and Thoroughbreds tend to have high resting tonus whereas drafters and Friesians have a low resting tonus.
- Muscles lacking their characteristic landmarks, topography, tuberosities, and details.
- Muscle action inconsistent to the action or movement.
- Incorrect planes.
- Incorrect placement of features, typically of landmarks and muscle groups.
- Incorrect proportion.
- Inadequate age morphology.
- A lack of secondary sex characteristics.
- Out of scale aspects.
- Forgetting the effects of "moment," and cause and effect when it comes to texture, balance, posture, emotion, flesh, and physics.
- A lack of texture and detail.
- The wrong shape.
- Muscle quality inconsistent to the breed. For example, an Arabian with highly defined stockhorse-type musculature.
- Formulaic musculature when, in reality, flesh morphs with motion, posture, balance, emotion, physics, and "moment," distorting away from the contrived order of an anatomy chart. Horses don’t move like jointed anatomical paper dolls.
- Habitual musculature despite motion, posture, individuality, breed, or balance. Musculature should vary based on the factors.
- The convergence of muscles groups misinterpreted.
Fascia
Fascia connects everything together as one integrated system while also encapsulating muscles to help give them their shape. Fascia also helps to give flesh and hide texture with lumps, bumps, rippling, creases, crinkling, stretches, striations and other idiosyncrasies of the surface topography. In essence then, fascia is the connective, supportive, organizational and bracing structure of the entire body, providing a continuous, complex network of binding tissue that maintains order and links every aspect of the body to everything else.
Fascia (fasciae for plural) comes in many forms and is an extremely important part of the body. Overall, it’s a tough, connective, supportive band, layer, sleeve, or sheet for all aspects of the body from muscles to bones to organs. There are four basic different types of fascia:
- “Fiber” fascia: Like a dense web of fibers or strands. It’s often used to lash things together like skin to the body.
- “Bubble” fascia: This is similar, but it has multitudes of thin membranes formed into little pockets full of oil or other viscous fluids. This kind of fascia is prevalent in areas of friction to reduce it and to also function as heat sinks there such as under the scapula and around the muscles of the hindquarter. Fat is often deposited in this type of fascia, which can lead to cellulite, or that lumpy appearance.
- “Sheet” fascia (also called an aponeurosis): A non-stretchy sheet of matted collagen fibers often used to help support structures, such as the gut and legs.
- “Jello” fascia: A loose mushy tissue often found wrapping nerves and organs.
The superficial or subcutaneous fascia, typically fiber fascia, glues the skin to the underlying features and contains the voluntary cutaneous (skin) muscles that serve as the “fly shakers."
The deep fascia, typically aponeurotic fascia, has more functions and is consequently very complex, more dense, and highly developed on the limbs. It sheaths muscles in a close-fitting septa (sleeve), separating and directing muscle function along specific parameters while also attaching to the periosteum and thereby providing routes for vessels, nerves, and the lymphatic system. It also encases joints, blends with ligaments and tendon sheaths, and is tough enough to also serve as direct attachment for some important muscles. It also facilitates definition and shape to muscle masses while also acting as a powerful supportive tissue for viscera (guts). Being well developed in the legs, it provides definition, organization and stabilization of limb features and mechanisms.
Yet fascia is typically ignored in both anatomical study and sculpture despite it being so critically important. Indeed, fascia is stripped away in dissection to reveal the muscles so we have to regard anatomy diagrams with a
grain of salt. So being routinely overlooked, fascia typically suffers these errors:
- Forgetting the effects of "moment," and cause and effect when it comes to texture.
- Formulaic or habitual texture when, in reality, texture morphs with motion, physics, and "moment."
- Ignoring, misaligning, or incorrectly structuring the Tensor Fascia Lata.
- A lack of hide or fascia texture, the sculpture having a hyper-smooth surface instead which is a function of artistic style rather than reality.
- Texture that lacks the proper fleshy, squishy appearance being too harshly sculpted.
Goo
"Goo" refers to the organic, fleshy, squishable nature of flesh. It pooches, squishes, stretches, ripples, crinkles, bulges, dips, has striations, dimples, warp, twist, distort, buckles, wrinkles, and assumes all manner of distortions in response to motion, emotion, balance, posture, and physics. It can entail muscles, fascia, fat, the hide, and other fleshy aspects of the body. So unless we capture the nature of Goo in our clay, our sculpture will appear inert and artificial.
Yet Goo is often ignored in sculpture, being largely overlooked in life study and non-existent in anatomy diagrams, which is why so many pieces don't look as believable as they could. To avoid that then, it's smart to avoid these typical errors:
- Incorrect topography, often inconsistent with the depicted motion.
- Forgetting to infuse physics, posture, balance, inertia, or emotion into Goo.
- Incorrect planes.
- Incorrect placement of features, typically of landmarks and ligamentary and tendinous groups.
- Incorrect proportion.
- Inadequate age morphology; the foot bones on foals are markedly different from adults.
- When articulated, the limbs lack Goo such as wrinkles, ripples, pooches, or buckled flesh.
- Forgetting the effects of "moment," and cause and effect when it comes to flesh, articulation, balance, posture, emotion, and physics.
- Out of scale features.
- Lack of texture and detail.
- Formulaic Goo when, in reality, flesh morphs with motion, posture, balance, emotion, physics, and "moment," distorting away from the contrived order of an anatomy chart. Horses don’t move like jointed anatomical paper dolls.
- Static flesh despite motion, emotion, balance, posture, or physics.
- The convergence of Goo not distorting enough, or with enough effects.
- Too much Goo or too little Goo.
- Goo that lacks a fleshy, squishable appearance being rendered too rigidly or harshly.
- Goo that doesn't stretch as needed in strategic places.
Ligaments and Tendons
Tendons are stretchy strap-like extensions of muscles while ligaments attach bone to bone and are unstretchable straps (there are a few exceptions such as the Nuchal ligament, Suspensory ligament, and the neck portion of the Supraspinous ligament). The tendons facilitate energy storage and release, and help to animate the skeleton, and are critical components of the pulley-systems of the legs, the Stay Apparatus, and the Reciprocal Apparatus. Ligaments stabilize, support, and connect joints, but some also function to store and release energy.
Yet like fascia, ligaments and tendons are often ignored or treated like afterthoughts despite their importance to anatomy. Because of this, they often have these errors:
- Structural asymmetries.
- Alignments, topography, and landmarks in error.
- Incorrect topography, often inconsistent with the depicted motion.
- Ligamentary and tendinous landmarks, topography, and details are missing, incorrect, or misplaced.
- Incorrect planes.
- Incorrect placement of features.
- Incorrect proportion.
- Out of scale features.
- Forgetting the effects of "moment," and cause and effect when it comes to definition, texture, balance, posture, emotion, flesh, and physics.
- Leg tendons and ligaments not defined enough such as on the cannon.
- Cannon tendons and ligaments with "pills," tears, crooked, undulating, or wavy.
- Seen from the back of the cannon, tendons that are too wide or too narrow.
- Tendons and ligaments that don't look "strappy" and taut.
- Joints without crisp tendinous definition which can be important for foals and certain thin-skinned breeds such as the Arabian and Teke.
Details
