http://www.timoniumfootandankle.com/c... The tarsal tunnel is a space located along the inside (medial side) of the ankle. The roof of the space is known as the laciniate ligament or flexor retinaculum. The tarsal tunnel in the ankle is the equivalent of the carpal tunnel in the wrist. Tarsal tunnel syndrome is an entrapment or compression neuropathy that occurs as the posterior tibial nerve is compressed as it travels through the tarsal tunnel into the foot.