The |tibialis posterior|, as the name indicates, originates from the back of the |tibia|. It also originates from the inside surface of the |fibula| (Lower leg bone) and the tissue between the two bony surfaces. It is a deep muscle, but towards the lower end emerges and passes in front of the |flexor digitorum longus| muscle and tapers into a ~tendon~ that inserts into six |tarsal bones| (navicular, three cuniforms, cuboid, and |talus|) and the bases of the second, third, and fourth |metatarsals|. This muscle flexes the foot and, working with the |tibialis anterior|, turns the sole of the foot inward. It is the strongest support for the arch of the foot.
