Author: Gordana Sendic•Reviewer: Jana VaskovićLast reviewed: May 31, 2021Reading time: 3 minutes

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Flexor pollicis brevis muscle (Musculus flexor pollicis brevis)

Flexor pollicis brevis is a brief, wide intrinsic muscle of the hand. With Each Other via opponens pollicis, adductor pollicis and abductor pollicis brevis, it comprises the team of thenar muscles.

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Flexor pollicis brevis is created of superficial and deep heads. However, the deep head deserve to differ in size and also periodically also be missing.

Like the other thenar muscles, flexor pollicis brevis acts on the thumb and flexes it at the metacarpophalangeal joint.

This short article will certainly talk about the anatomy and attributes of the flexor pollicis brevis muscle.

Key facts around the flexor pollicis brevis
OriginSuperficial head: Flexor retinaculum, tubercle of trapezium boneDeep head: Trapezoid and capitate bones
InsertionLateral facet of base of proximal phalanx 1 (using radial sesamoid bone)
ActionCarpometacarpal and metacarpophalangeal joint 1: Thumb flexion
InnervationSuperficial head: Represent branch of median nerveDeep head: Deep branch of ulnar nerve (C8, T1)
Blood supplySuperficial palmar artery, princeps pollicis artery and also radialis indicis artery

Contents
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Flexor pollicis brevis is the many medial of the thenar muscles. It lies medial to the abductor pollicis brevis and also opponens pollicis muscles, while it is lateral to adductor pollicis muscle

Alengthy its course, the superficial head of the muscle passes along the radial side of the tendon of flexor pollicis longus, whereas the deep head passes deep to the exact same tendon. In addition, the superficial head is commonly blended through the opponens pollicis muscle. The superficial surface of the muscle is crossed by the motor branch of the median nerve.

Innervation

The 2 heads of the flexor pollicis brevis commonly differ in their innervation. The superficial head of flexor pollicis muscle receives nervous supply from the represent branch of the median nerve, whereas the deep head receives innervation from the deep branch of the ulnar nerve, obtained from spinal roots C8 and also T1.

The hand also is complete of facility muscles. Learn their anatomy properly and also actively utilizing juniorg8.com"s muscle anatomy and also recommendation charts!

Blood supply

Flexor pollicis brevis receives arterial supply from branches of the radial artery; superficial palmar artery, branches of the princeps pollicis artery and radialis indicis artery.


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Function

As a component of the thenar muscles, flexor pollicis brevis acts upon the thumb and produces flexion at the metacarpophalangeal and carpometacarpal joints. This activity aids in opplace of the thumb and, if continued, it produces the medial rotation of thumb.

Flexor pollicis brevis have the right to be tested and also palpated on the thenar eminence when the thumb is flexed versus resistance.


Sources

References:

Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Clinically Oriented Anatomy (7th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.Palastanga, N., & Soames, R. (2012). Anatomy and also human movement: structure and attribute (sixth ed.). Edinburgh: Churchill Livingrock.Standring, S. (2016). Gray"s Anatomy (41tst ed.). Edinburgh: Elsevier Churchill LivingstoneSingh, V. (2010). Anatomy of Upper Limb and Thorax; London: Elsevier Health Sciences.

Illustrators:

Flexor pollicis brevis muscle (Musculus flexor pollicis brevis) - Yousun Koh

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