Tibialis posterior
Lower legs
Deep muscle — it lies under other muscles. X-ray makes the muscles over it see-through.
- Origin
- Back of the tibia and fibula and the interosseous membrane
- Insertion
- Navicular tuberosity, the cuneiforms, cuboid and bases of metatarsals 2 to 4
- Action
- Inverts the foot and plantarflexes the ankle; supports the arch
- Nerve supply
- Tibial nerve (L4–L5)
The deepest muscle on the back of the lower leg. Its tendon runs behind the inner ankle into the sole, where it helps hold up the arch of the foot.
Tibialis posterior anatomy page →