Abductor pollicis brevis muscle

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The abductor pollicis brevis muscle is a muscle in the hand that abducts the thumb (pulls it away from the index finger).


Abductor digiti minimi muscle (Hand) Flexor digiti minimi brevis muscle (Hand) Lumbrical muscles (Hand) Lumbrical muscles (Hand) Lumbrical muscles (Hand) Lumbrical muscles (Hand) Palmaris brevis muscle Flexor pollicis brevis muscle Abductor pollicis brevis muscle Opponens pollicis muscle Adductor pollicis muscle'The muscles of the hand.'

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Anatomy diagram of a left hand, with the palm facing forward.

Contents

Origin

The abductor pollicis brevis muscle originates from the wrist, at the tubercle of the scaphoid bone and the flexor retinaculum.

Insertion

The abductor pollicis brevis muscle inserts on the thumb, at the radial sesamoid of the proximal phalanx of the thumb and the tendon of the extensor pollicis longus muscle.

Action

The abductor pollicis brevis muscle abducts the thumb at the metacarpophalangeal and carpometacarpal joints.

Innervation

The abductor pollicis brevis muscle is innervated by the recurrent branch of the median nerve (C8, T1). In some individuals, it is innervated by the ulnar nerve.

See also

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