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Abductor pollicis longus

Other Terms: Musculus abductor pollicis longus, Muscle long abducteur du pouce

Muscle parts

None

Latin name

Musculus abductor pollicis longus

Latin muscle parts

None

Group

Antebrachial muscle – posterior compartment – radial group

Etymology

In English, this muscle’s name is the long muscle that leads the thumb away (from the palm). Abductor is a term that describes the function or action of the muscle. It literally means to draw or to lead away from and is derived from the Latin ab meaning “away from” and ducere meaning “to lead or to draw.” The Latin pollex meaning “thumb” arises from the Latin polleo meaning “to be strong,” as the thumb was the strongest of the fingers. Longus is the Latin term meaning “long.” This is being used as a comparative reference to a shorter muscle that does the same thing.

Origin

Posterior surface of mid-ulna and mid-radius and interosseous membrane

Insertion

Base of the palmar side of 1st metacarpal bone

Action

Abducts the thumbs – assists the abductor pollicis brevis with abduction of the thumb Extends the carpometacarpal joint of the thumb – assists the extensor muscle of the thumb with this movement.

Nerve supply

Radial nerve (C7 and C8)

Blood supply

Posterior interosseous artery.

Latin

Musculus abductor pollicis longus

French

Muscle long abducteur du pouce

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