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Flexor digitorum longus muscle

German: Musculus flexor digitorum longus

1 Definition

The flexor digitorum longus muscle is a skeletal muscle of the lower leg that belongs to the deep calf muscles.

2 Devolution

The origin of the flexor digitorum longus muscle is situated at the posterior surface and the medial edge of the tibia.

The tendon of the flexor digitorum longus muscle crosses the tendon of the tibialis posterior muscle in the distal section of the lower leg, and it forms the so-called crural chiasm. Further distally, in the region of the foot sole, the tendon of the flexor digitorum longus muscle crosses the tendon of the flexor hallucis longus muscle anf forms the so-called plantar chiasm.

The tendon of the flexor digitorum longus muscle inserts at the distal phalanges of the IInd-5th toe and serves as orgin of the lumbricales pedis muscles.

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3 Innervation

Its innervation is provided by the tibial nerve, with fibers from the S1 and S2 segments.

4 Function

The flexor digitorum longus muscle effects a flexion of the toes and a plantar flexion of the foot. Moreover, it takes part in the supination of the foot.

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