Tibialis Posterior:Origin, Insertion, Action & Nerve Supply
Tibialis Posterior: The tibialis posterior is central of all the leg muscles and is placed in the deep posterior compartment of the leg.It is the fundamental stabilizing muscle of the lower leg.Origin: Proximal two-thirds of the posterior surfaces of the tibia and the fibula and the interosseous membrane.
Insertion: The tibialis posterior muscle separates into two sheets later crossing inferior to the plantar calcaneonavicular ligament; the superficial slip inserts on the tuberosity of the navicular and sometimes medial cuneiform bone; deeper slip distributes again into slips inserting on plantar surfaces of metatarsals 2 – 4 and second cuneiform bone.
Function: Key invertor of the foot; further adducts foot, plantar flexes ankle joint, and assists to supinate the foot.
Nerve Supply: Tibial nerve (L4, L5).