TIBIALIS POSTERIOR
| ORIGIN Upper half of posterior shaft of tibia and upper half of fibula between medial nerve crest and interosseous border, and interosseous membrane |
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| INSERTION Tuberosity of navicular bone and all tarsal bones (except talus) and spring ligament |
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| ACTION Plantar flexes and inverts foot. Supports medial longitudinal arch of foot |
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| NERVE Tibial nerve (L4, 5) |