The flexor hallucis brevis is an intrinsic muscle of the foot. It is located within the third plantar muscle layer of the foot and has two heads of origin.
- Lateral head – originates from the plantar surfaces of the cuboid and lateral cuneiforms
- Medial head – originates from the tendon of the posterior tibialis tendon.
- The fibres converge into a single muscle belly, which attaches to the base of the proximal phalanx of the great toe.
- Actions: Flexion of the great toe at the metatarsophalangeal joint.
- Innervation: Medial plantar nerve.
- Blood Supply: Posterior tibial and fibular arteries.