The Posterior Ligament is situated behind the joint, and is much thicker than the anterior, having in its centre a quantity of fibro-cartilage, over which glides the perforans tendon in its course to the foot. On either side its fibres mix with those of the superficial lateral ligament, and in front, where it faces the joint, it is lined by synovial membrane. Above it is attached to the tibia, and below to the astragalus and calcaneus.

Fig. 361. - External View of Hock-Joint.

1, Tibia. 2, Calcis. 3, Astragalus. 4, Os magnum. 5, Os medium. 6, Cuboid. 7, Calcaneocuboid ligament. 8, Deep set of ligaments connecting one bone with another. 9, Large metatarsal bone. 10, Small metatarsal bone.

The joints below the hock are the same as those below the knee, which have already been described in considering the articulations of the fore-limb.