The ulnae and fibulae are reduced in horses. A distinct foramen is observable between the tuberculum carpale and the condylus ventralis ulnae. The humeri are 10 mm long, and have unequal attachments for the ulnae and radii. However, the wide ulnae fit the exceptional distal width of the humerus. The radii and ulnae of "Thrinaxodon" represent roughly the same histological patterns.