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Flexor hallucis longus muscle

Synonym: flexor proprius hallucis muscle
German: Musculus flexor hallucis longus

1 Definition

The flexor hallucis longus muscle is a skeletal muscle belonging to the flexor group of the lower leg, that forms part of the deep calf muscles.

2 Devolution

The origin of the flexor hallucis longus muscle lies in the posterior surface of the fibula, the middle tibiofibular ligament and the posterior crural intermuscular septum.

The tendon of the muscle changes its axis in the region of the tarsus and passes below the sustentaculum tali in a trough-shaped indentation, the sulcus of the tendon of the flexor hallucis longus muscle. Finally, it inserts further in anterior direction on the distal phalanx of the big toe. The tendon sends small secondary tendons to the distal phalanges of the 2nd to 4th toe.

Due to the lateral origin and the medial insertion, the tendon of the flexor hallucis longus muscle crosses the tendon of the flexor digitorum longus muscle from below, which is called plantar chiasma in morphology.

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3 Innervation

The innervation of the flexor hallucis longus muscle is provided by the tibial nerve.

4 Function

A contraction of the flexor hallucis longus muscle causes a plantar flexion and supination of the foot.

When standing, the flexor hallucis longus muscle stabilizes the longitudinal arch of the bones of the foot. The plantar chiasma is of exceeding significance for this to function well.

Specialties: Anatomy

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