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These and other sophisticated devices in the joints of the extremities horses are adaptive traits acquired the horse in the process of its evolution and specialization, which suffered its limbs.
Skeleton of both limbs (front and back) can be regarded as a complex system monoshoulder and doubleshoulder levers. Homologous to each other not only individual links in the limbs, but also educated them joints, tops of which are directed at both legs in opposite directions (exception - the finger joints) (Fig. 2).
Articulation of limbs at angles consistently different direction, promotes, according to the law of the parallelogram of forces, the expansion of gravity and antistrikes into their constituents. One of the scattering centers protivoudarov and expansion of the force of gravity is karpalnsh and tarsalny joints, bones which have a number of articular facets, tilted at different angles.
Sort of a spring device that serve as cushion against injury to the hoof, is the metacarpophalangeal (metatarsal) longeal joint, with his sesamoid bones and volyarnym tendon-ligament mechanism that strengthens the top of the joint.