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Abductor pollicis brevis muscle

Muscle of the thumb

Summary

Muscle of the thumb

Field	Value
Name	Abductor pollicis brevis muscle
Latin	musculus abductor pollicis brevis
Image	1121 Intrinsic Muscles of the Hand Superficial sin.png
Caption	Superficial muscles of the left hand, palmar view
Origin	Transverse carpal ligament, the scaphoid and trapezium
Insertion	Base of the proximal phalanx of thumb
Action	Abduction of the thumb by acting across the carpometacarpal joint and the metacarpophalangeal joint. It also assists in opposition and extension of the thumb.
Antagonist	Adductor pollicis muscle
Blood	Superficial palmar arch
Nerve	Recurrent branch of the median nerve

The abductor pollicis brevis is a muscle in the hand that functions as an abductor of the thumb.

Structure

The abductor pollicis brevis is a flat, thin muscle located just under the skin. It is a thenar muscle, and therefore contributes to the bulk of the palm's thenar eminence.

It originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from the tubercle of the trapezium.

Running lateralward and downward, it is inserted by a thin, flat tendon into the lateral side of the base of the first phalanx of the thumb, and the capsule of the metacarpophalangeal joint.

Nerve supply

The abductor pollicis brevis is supplied by the recurrent branch of the median nerve (Roots C8-T1).

Function

Abduction of the thumb is defined as the movement of the thumb anteriorly, a direction perpendicular to the palm. The abductor pollicis brevis does this by acting across both the carpometacarpal joint and the metacarpophalangeal joint.

It also assists in opposition and extension of the thumb.

Additional images

File:Slide1t.JPG|Cadaver dissection

References

[http://eatonhand.com/mus/mus003.htm Eatonhand - Abductor Pollicis Brevis]
(2013-01-01). "6 - Repetitive Nerve Stimulation". W.B. Saunders.
(2009-01-01). "Chapter 6 - The CMAP scan". Elsevier.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

muscles-of-the-upper-limb upper-limb-anatomy

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