A small muscle situated at the back of the leg on the inner side of the one last described.

Origin. - From the upper and back part of the head of the tibia or leg-bone.

Insertion. - After passing through a groove on the inner side of the hock-joint, where it is lubricated with synovia, the tendon of this muscle continues downward to blend with that of the flexor pedis perforans about the upper third of the canon bone.

Action. - To assist in flexing the foot and fetlock.