Anatomy similar to that of the wrist and hand exists in the ankle and foot. Tarsal is a word from Latin which means ankle. The tarsal tunnel refers to the canal formed between the medial malleolus (part of the ankle bone, this is the bump on the inside of the ankle) and the flexor retinaculum (a band of ligaments that stretches across the foot). Inside the tarsal tunnel are the nerves, arteries, and tendons that provide movement and flexibility to the foot. The sensory nerve in the ankle, the tibial nerve, passes through the tarsal tunnel and can be compressed and irritated causing numbness and tingling of the foot and toes as this nerve provides sensation to the bottom of the foot. Tarsal tunnel syndrome has also been called posterior tibial neuralgia. This condition is far less common than carpal tunnel syndrome (CTS).