flexor hallucis brevis

Also found in: Acronyms.

flexor hallucis brevis

short flexor muscle of great toe; a muscle that inserts in the base of the proximal phalanx of the great toe and flexes it. It is innervated by the medial plantar nerve.

flexor hallucis brevis

; FHB fourth-layer intrinsic foot muscle
  • origin from plantar aspect of cuboid and adjoining fascia; divided into two bellies

  • insertion into medial and lateral margins of plantar aspect of proximal phalanx of hallux (medial tendon with abductor hallucis tendon, and lateral tendon with adductor hallucis tendon); each FHB tendon contains a sesamoid bone which contributes to first metatarsophalangeal joint depth and function

  • nerve supply medial plantar nerve

  • action first metatarsophalangeal joint flexion, and assisting forefoot adduction

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