• Source: Flexor hallucis brevis muscle

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




Structure



Flexor hallucis brevis muscle 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 muscle 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 muscle previous to its insertion; the lateral portion (sometimes described as the first plantar interosseus) with the adductor hallucis muscle. The tendon of the flexor hallucis longus muscle lies in a groove between the two. Its tendon usually contains two sesamoid bones at the point under the first metatarsophalangeal joint.




= 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 bone sometimes wanting. Slip to first phalanx of the second toe.




Function



Flexor hallucis brevis flexes the first metatarsophalangeal joint, or the big toe. It helps to maintain the medial longitudinal arch. It assists with the toe-off phase of gait providing increased push-off.




Clinical significance


Sesamoid bones contained within the tendon of flexor hallucis brevis muscle may become damaged during exercise.




Additional images




















References


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




External links


PTCentral

Kata Kunci Pencarian:

• Saraf plantar medial
• Flexor hallucis brevis muscle
• Extensor hallucis brevis muscle
• Flexor hallucis longus muscle
• Abductor hallucis muscle
• Flexor brevis muscle
• Hallucis brevis muscle
• Flexor hallucis muscle
• Flexor digitorum longus muscle
• Hallucis muscle
• Extensor hallucis longus muscle