In ungulates, the medial collateral ligament extends between the medial styloid process of the radius and the proximal extremity of the medial metacarpal bone. A deep branch is detached to the second carpal bone.
In carnivores, medial collateral ligament is necessarily much weaker allowing for some adduction and abduction. It is divided into a straight and and oblique part:
The tendon of the abductor pollicis longus lies between the two parts as it crosses the medial surface of the carpus.