Name Extensor hallucis longusPronunciation (eks-TEN-sor HA-loo-sus LONG-gus) Origin/Proximal Attachment Medial aspect of fibula – middle ½ Adjacent anterior surface of interosseous membrane Crural fascia Insertion/Distal Attachment Dorsal surface of base of proximal & distal phalanx of hallux (big toe)? (At the MTP joint a thin prolongation from each side of the tendon covers the dorsal surface of the joint) (An expansion from the medial side of the tendon to the base of the proximal phalanx is usually present) Action/Relevance Extends the distal phalanx of big toe Weakly dorsiflexes foot Weakly inverts & adducts foot Innervation Deep peroneal nerve (L4, 5,S1) Notes Lies between, & partly deep to, tibialis anterior & extensor digitorum longus Arises medial to extensor digitorum longus Anterior tibial vessels & deep peroneal nerve lie between it & tibialis anterior Its fibres run distally & end in a tendon which forms on anterior border of the muscle The tendon passes deep to the superior extensor retinaculum & through the inferior extensor retinaculum, crosses to medial side of the anterior tibial vessels | 
