Articular capsules

In carnivores, the joint capsules extend dorsal and palmar recesses (pouches), enforced palmarly by a sesamoid cartilage. The joint capsule is thickened to form the collateral ligaments, which attach proximally to the shallow depressions on each side of the head of the middle phalanx and extend obliquely caudodistally to attach to the sides of the ungual crest of the distal phalanx.