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Muscles of the Lower Extremity / Tibialis Posterior
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| Origin |
Posterior aspect of interosseous membrane, superior 2/3 of medial posterior surface of fibula, superior aspect of posterior surface of tibia, and from intermuscular septum between muscles of posterior compartment and deep transverse septum |
| Insertion |
Splits into two slips after passing inferior to plantar calcaneonavicular ligament; superficial slip inserts on the tuberosity of the navicular bone and sometimes medial cuneiform; deeper slip divides again into slips inserting on plantar sufraces of metatarsals 2 - 4 and second cuneiform |
| Action |
Principal invertor of foot; also adducts foot, plantar flexes ankle, and helps to supinate the foot |
| Innervation |
Tibial nerve (L4, L5) |
Arterial
Supply |
Muscular branches of sural, peroneal and posterior tibial arteries |
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