|Tibialis posterior muscle|
The mucous sheaths of the tendons around the ankle. Medial aspect. (Tibialis posterior labeled at top center.)
|Origin||Tibia and fibula|
|Insertion||Navicular and medial cuneiform bone|
|Artery||Posterior tibial artery|
|Actions||Inversion of the foot and plantar flexion of the foot at the ankle|
|Antagonist||Fibularis brevis and longus, antagonist to the inversion.|
|Latin||Musculus tibialis posterior|
|Anatomical terms of muscle|
It is the key stabilizing muscle of the lower leg.
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 main portion inserts into the tuberosity of the navicular and the plantar surface of the medial cuneiform. The plantar portion inserts into the bases of the second, third and fourth metatarsals, the intermediate and lateral cuneiforms and the cuboid. The recurrent portion inserts into the sustentaculum tali of the calcaneus.
As well as being a key muscle and tendon for stabilization, the tibialis posterior also contracts to produce inversion and assists in the plantar flexion of the foot at the ankle. The tibialis posterior has a major role in supporting the medial arch of the foot. Dysfunction of the tibialis posterior, including rupture of the tibialis posterior tendon, can lead to flat feet in adults, as well as a valgus deformity due to unopposed eversion when inversion is lost.
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