Tibialis posterior

Tibia, Fibula

Navicular, medial cuneiform

Inversion of the foot, plantar flexion of the foot at the ankle

Tibial nerve

Posterior tibial artery

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Function:

As well as being a key muscle/tendon for stabilization, the tibialis posterior muscle also contracts to produce inversion of the foot and assists in the plantar flexion of the foot at the ankle.

Tibialis posterior also has a major role in supporting the medial arch of the foot and therefore dysfunction can lead to flat feet in adults (as well as unopposed eversion as inversion is lost, leading to a valgus deformity).