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The tibialis anterior (Latin: musculus tibialis anterior) is a long narrow fusiform-shaped muscle located in the anterior compartment of the leg. The anterior compartment muscles of the leg are known as the extensors, and the tibialis anterior is the main foot dorsiflexor. Also, it is the most superficial and largest muscle of the group. The tibialis anterior stretches between the tibia and bones of the foot.
|Origin||Lateral condyle of tibia, superior two-thirds of lateral surface of tibia, interosseous membrane of leg, deep surface of fascia cruris, intermuscular septum|
|Insertion||Medial cuneiform bone, base of first metatarsal bone|
|Action||Foot dorsiflexion, foot inversion, supports medial longitudinal arch of foot|
|Innervation||Deep peroneal (fibular) nerve (L4 - S1)|
|Blood supply||Branches of anterior and posterior tibial arteries|
The tibialis anterior muscle originates from the lateral condyle and upper two-thirds of the lateral surface of the tibia. Additionally, it arises from the interosseous membrane of the leg, deep surface of the fascia cruris and the intermuscular septum between it and the extensor digitorum longus muscle.
The tibialis anterior muscle provides dorsiflexion at the talocrural (ankle) joint and inversion of the foot at the subtalar and midtarsal (Chopart's) joints. Also, it supports the medial longitudinal arch of the foot.