Tarsal Tunnel

The narrow space in the inner foot beside the ankle bones is known as the tarsal tunnel. A ligament, flexor retinaculum, covers the tunnel as it extends posteriorly from the medial malleolus. This ligament protects the nerves, veins, arteries, and tendons within the tarsal tunnel. The tibial nerve, one of the structures in the tunnel, is the focus of a condition called Tarsal Tunnel Syndrome.