Tibialis posterior muscle

The tibialis posterior is the most central of all the leg muscles, and is located in the deep posterior compartment of the leg.

It is the key stabilizing muscle of the lower leg.

Blood is supplied to the muscle by the posterior tibial artery, and innervation is via the tibial nerve.

Structure

The tibialis posterior muscle originates on the inner posterior borders of the tibia and fibula. It is also attached to the interosseous membrane, which attaches to the tibia and fibula.

The tendon of the tibialis posterior muscle (sometimes called the posterior tibial tendon) descends posterior to the medial malleolus and terminates by dividing into plantar, main, and recurrent components. The plantar portion inserts into the bases of the second, third and fourth metatarsals, the second and third cuneiforms and the cuboid. The main portion inserts into the tuberosity of the navicular and the plantar surface of the first cuneiform. The recurrent portion inserts into the sustentaculum tali of the calcaneus.