Muscle
Tibialis posterior
Chief invertor, supports arch
High-yield
Prime invertor and arch support; tibial nerve. Dysfunction → acquired flatfoot (pes planus).
Overview
The deepest posterior leg muscle, the main invertor of the foot and a key support of the medial longitudinal arch.
Reference facts
- Origin
Interosseous membrane and adjacent posterior tibia and fibula
- Insertion
Navicular tuberosity, cuneiforms, cuboid, and bases of metatarsals 2–4
- Action
Inverts the foot and plantarflexes the ankle; supports the medial longitudinal arch
- Innervation
Tibial nerve (L4, L5)
- Blood supply
Posterior tibial / fibular arteries