Specimen Image
This muscle is the most anterior and medial of all four anterior leg muscles. It originates from the proximal portion of the leg, precisely, from the lateral tibial condyle and proximal half of the tibial shaft, in addition to the adjacent portion of the interosseous membrane.
In the distal portion of the leg, the muscle fibers converge to form a tendon that extends through the medial side of the foot toward the muscle’s insertion; the medial cuneiform bone (medial and inferior surface), and base of the first metatarsal bone. The main function of this muscle is to dorsiflex the foot, as well as invert it. It also supports the medial longitudinal arch of the foot.