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Dr. Ebraheim’s educational animated video describes the anatomy of the flexor digitorium muscle. It arises from the posterior surface of the midtibia immediately below the soleal line and medial to the tibial origin of the tibialis posterior. It is medial to an imaginary vertical line that separates the tibialis anterior muscle from the flexor digitorum longus. The tendon of the flexor digitorum longus passes behind the medial malleolus in a groove. This groove also contains the tendon of the tibialis posterior. Here is a mnemonic phrase used in memorizing the order of the artery, the nerve and the three tendons of the flexor retinaculum in the lower leg: the T, D a, n, and H of Tom, Dick and Harry correspond to tibialis posterior, flexor digitorum longus, posterior tibial artery, tibial nerve and flexor hallucis longus. After the tendons curve under the medial malleolus and talus, they begin to converge and then cross each other. The flexor hallucis longus tendon is crossed deep to the flexor
