Name
Pronunciation
(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