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Extensor hallucis longus muscle

Synonym: long extensor of the big toe, extensor proprius hallucis
German: Musculus extensor hallucis longus

1 Definition

The extensor hallucis longus muscle is a thin skeletal muscle that belongs to the group of the lower leg muscles.

2 Devolution

2.1 Origin

The surfaces of origin of the extensor hallucis longus muscle are the anterior surface of the fibula and the middle tibiofibular ligament. In some cases, the origin of the muscle can be joined to the extensor digitorum longus muscle.

2.2 Insertion

The tendon of the extensor hallucis longus muscle passes in its own tendon compartment below the superior extensor muscle retinaculum and the inferior extensor retinaculum to the forefoot. In the transition from the lower leg to the back of the foot, it crosses the anterior tibial artery from the lateral to the medial side of the vessel. Finally, it inserts on the dorsal surface of the distal phalanx of the big toe.

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3 Innervation

The innervation of the extensor hallucis longus is provided by the deep peroneal nerve from the sacral plexus (L4-S1).

4 Function

A contraction of the extensor hallucis longus muscle causes an extension of the big toe. Moreover, the muscle supports the supination of the foot in the lower ankle joint.

Specialties: Anatomy

This page was last edited on 17 January 2017, at 11:01.

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