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Abductor pollicis brevis muscle

Abductor pollicis brevis muscle
File:Musculusabductorpollicisbrevis.png
Abductor pollicis brevis visible at center right.
Details
Latin musculus abductor pollicis brevis
Transverse carpal ligament, the scaphoid and trapezium[1]
Radial base of proximal phalanx of thumb and the thumb extensors[1]
Superficial palmar arch
Recurrent branch of the median nerve
Actions Abduction of the thumb by acting across the carpometacarpal joint and the metacarpophalangeal joint. It also assists in opposition and extension of the thumb.
Adductor pollicis muscle
Identifiers
Gray's p.461
Dorlands
/Elsevier
m_22/12548307
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Anatomical terms of muscle

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.

Innervation

The abductor pollicis brevis is innervated by the recurrent branch of the median nerve. C8/T1

Actions

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

Nerves of the left upper extremity 
Cadaver dissection 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Abductor pollicis brevis muscle 
Muscles of hand. Cross section. 

References

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

External links

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