Flexor hallucis brevis muscle

Flexor hallucis brevis muscle
Flexor hallucis brevis muscle
	Muscles of the sole of the foot. Third layer. (Flexor hallucis brevis visible at left.)
Details
Origin	plantar surface of cuboid and lateral cuneiform bones
Insertion	base of proximal phalanx of hallux
Nerve	medial plantar nerve
Actions	flex hallux
Antagonist	Extensor hallucis longus muscle
Identifiers
Latin	musculus flexor hallucis brevis
TA98	A04.7.02.057
TA2	2673
FMA	37449
	Anatomical terms of muscle [edit on Wikidata]

The Flexor hallucis brevis arises, by a pointed tendinous process, from the medial part of the under surface of the cuboid bone, from the contiguous portion of the third cuneiform, and from the prolongation of the tendon of the Tibialis posterior which is attached to that bone.

Structure

It divides in front into two portions, which are inserted into the medial and lateral sides of the base of the first phalanx of the great toe, a sesamoid bone being present in each tendon at its insertion.

The medial portion is blended with the Abductor hallucis previous to its insertion; the lateral portion with the Adductor hallucis; the tendon of the Flexor hallucis longus lies in a groove between them; the lateral portion is sometimes described as the first Interosseous plantaris.

Innervation

Flexor hallucis brevis is innervated by the medial plantar nerve.

Variation

Origin subject to considerable variation; it often receives fibers from the calcaneus or long plantar ligament. Attachment to the cuboid sometimes wanting. Slip to first phalanx of the second toe.