Flexor Hallucis Brevis

Written by Sanya Trikha

Last updated January 31, 2023 • 5 Revisions •

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.

  • Attachments:
    • 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.

Fig 4
The third layer of plantar muscles.

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