Name

# Tibialis Anterior

Pronunciation

(tib-e-A-lus an-TEER-i-or)

Origin/Proximal Attachment

Lateral tibial condyle

Proximal 2/3 of anterolateral surface of tibia

Adjoining anterior surface of interosseous membrane

Anterior intermuscular septum

Deep surface of crural fascia

Insertion/Distal Attachment

Medial & plantar surface of base of 1st metatarsal

Medial & plantar surface of medial cuneiform

Action/Relevance

Powerfully dorsiflexes ankle (tibiotalar joint)

Inverts & adducts foot

Innervation

Deep peroneal nerve (L4,5,S1)

Notes

Superficial muscle

Palpable lateral to tibia

Descends vertically to end in a tendon on its anterior surface in lower 1/3 of the leg

Passes through medial compartments of the superior & inferior retinacula, inclines medially

Overlaps anterior tibial vessels & deep peroneal nerve in upper part of lower leg