Anatomy Text
Proximal attachment - Tibialis posterior originates from the
posterior surface of the interosseous membrane and from the adjacent
posterior surfaces of the shafts of the tibia and fibula.
Distal attachment - The tibialis posterior muscle passes
inferomedially deep to flexor digitorum longus, to end in a tendon which
grooves the back of the medial malleolus. The tendon turns forward
below the medial malleolus and passes beneath (inferior to) the spring
ligament. It inserts principally onto the tuberosity of the navicular, but
sends extensions onto all of the bones of the tarsus (except the talus).
Additionally, it sends extensions to the 2nd, 3rd, and 4th metatarsal
bases.
Nerve supply - Tibial nerve (L4, L5).
Action - Tibialis posterior is an invertor of the foot,. Additionally, it assists in plantarflexion
of foot at ankle joint. |
