TIBIALIS POSTERIOR
Origin
Upper half of post shaft of tibia and upper half of fibula between median crest and interosseous border, and interosseous membrane
Action
Plantar flexes and inverts foot. Supports med longitudinal arch of foot
Insertion
Tuberosity of navicular bone and all tarsal bones (except talus ) and spring lig
Nerve
Tibial N (L4, 5)
