Flexor hallucis brevis muscle

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The Flexor hallucis brevis is a muscle of the foot that flexes the big toe.

Video Flexor hallucis brevis muscle

Structure

It 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 (sometimes described as the first plantar interosseus) with the Adductor hallucis. The tendon of the Flexor hallucis longus lies in a groove between the two.

Innervation

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

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.

Maps Flexor hallucis brevis muscle

Function

It flexes the hallux together with the flexor hallucis longus muscle.

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Additional images

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References

This article incorporates text in the public domain from page 493 of the 20th edition of Gray's Anatomy (1918)

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External links

• PTCentral

Source of the article : Wikipedia