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Flexor digitorum longus is one of the muscles of posterior compartment of leg. This paper primarily focuses on the variation of flexor digitorum longus muscle of leg. Sixty inferior extremities were dissected. A small muscle taking origin from the tendon of flexor digitorum longus was observed. Some of the fibers were originating from the fascia covering the flexor digitorum longus and tibialis posterior. Its tendon merged with the tendon of flexor digitorum longus going to second digit in sole of foot and quadratus plantae. Nerve supply of this muscle was from a small branch of tibial nerve from its undersurface. Supernumerary muscles in the ankle joint or nearby region can be a factor of compression in tarsal tunnel syndrome. MRI is the modality of choice in diagnosing accessory muscles. Functional and clinical significance is important not only for the anatomist and clinicians but also for the pathologists and sports people.
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