Flexor hallucis brevis muscle

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Flexor hallucis brevis muscle
Musculus flexor hallucis brevis.png
Muscles of the sole of the foot. Third layer. (Flexor hallucis brevis visible at left.)
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
Latin musculus flexor hallucis brevis
TA A04.7.02.057
FMA 37449
Anatomical terms of muscle

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.


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.


The medial head of the flexor hallucis brevis is innervated by the medial plantar nerve. The lateral head is innervated by the lateral plantar nerve. Both are represented by spinal segments S1, S2.


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.


It flexes hallux together with musculus flexor hallucis longus

Additional images[edit]


This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links[edit]