Adductor pollicis muscle

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The adductor pollicis muscle is a muscle of the hand that adducts the thumb when contracted (pulls it inward toward the first finger).


Opponens pollicis muscle Adductor pollicis muscle Opponens quinti digiti muscle Muscles of the forearm (Anatomy map) Flexor carpi ulnaris muscle Abductor pollicis longus muscle Flexor retinaculum (Hand) Flexor carpi radialis muscle Palmaris longus muscle Flexor digitorum muscle Flexor digitorum superficialis muscle Pisometacarpal ligament First metacarpal bone'The muscles of the thumb.'

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The oblique head of the adductor pollicis seen above the transverse head.

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Origin

The adductor pollicis muscle originates from several points in the hand. The oblique head attaches at the base of the second and third metacarpals, the trapezoid bone and the capitate bone. The transverse head originates from the shaft of the third metacarpal bone.

Insertion

The adductor pollicis muscle inserts on the thumb at the base of the proximal phalanx. It also attaches to the tendon of the extensor pollicis longus muscle and the ulnar sesamoid.

Action

The adductor pollicis muscle adducts the thumb at the carpometacarpal joint.

Innervation

The adductor pollicis muscle is innervated by the deep branch of the ulnar nerve (T1).

Word origin

The adductor pollicis gets its name from its action: adductor refers to its action as an adductor, and pollicis means of the thumb.

See also

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