Extensor Hallucis Longus

Wikis > Anatomy > Muscles > Leg Muscles > Extensor Hallucis Longus

Extensor hallucis longus:
Proximal attachment – middle 1/2 of anterior medial surface of fibula; anterior surface of interosseous membrane
Distal attachment – base of distal phalanx of hallux. Thin slip separates from medial side of tendon and inserts into dorsomedial aspect of joint capsule (present in up to 90%) – thought to retract joint capsule during dorsiflexion – sometimes called extensor hallucis capsularis.
Open chain function – ankle dorsiflexion; tarsal inversion; hallux extension
Closed chain function – extension stability of the hallux
Nerve supply –deep peroneal (L4, L5, S1)
Arterial supply – anterior tibial artery

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