Medial border of foot

The inner edge of the foot, known as the medial border of foot, extends from the heel to the big toe.

The bones comprising the medial border are the calcaneum, head of the talus, navicular, medial cuneiform, the first metatarsal, and the phalanges of the big toe. When viewed from the side, these bones align in an arch-like fashion, forming the medial portion of the longitudinal arch of the foot.

The abductor hallucis, an intrinsic muscle, constitutes the muscular component of the medial margin.

Long tendons from the muscles of the posterior leg compartment (tibialis anterior, flexor hallucis longus, and flexor digitorum longus) pass through the tarsal tunnel and cross over the medial border of the foot to enter the sole. The tibialis anterior inserts into the navicular tuberosity along the medial border and several other tarsal bones. The flexor hallucis and flexor digitorum longus travel anteriorly within the sole and insert into the plantar side of the distal phalanges’ bases.

Prominent cutaneous vessels and nerves found along the medial border of foot include the saphenous nerve and the great saphenous vein.