Tibialis posterior
Musculus tibialis posterior
MuscularDeep musclesLegLeft and right
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- What it is
- The deepest muscle of the back of the leg, arising from the interosseous membrane and adjoining tibia and fibula between flexor digitorum longus and flexor hallucis longus.
- Function
- Inverts the foot and plantarflexes the ankle; the main dynamic support of the medial longitudinal arch.
- Size
- Belly about 20 cm; total length with tendon about 35 cm.
- Clinical note
- Tibialis posterior tendon dysfunction is the commonest cause of adult-acquired flatfoot.