abductor pollicis longus muscle

(redirected from musculus extensor ossis metacarpi pollicis)

abductor pollicis longus muscle

A long hand muscle that abducts the thumb, which arises from the dorsolateral surface of the ulna.
Moves thumb anteriorly (from anatomic position of the body in space) toward the base of the fifth finger.

Critical for
Thumb manoeuvrability, precision and power grip.

Posterior interosseous nerve—a continuation of the deep branch of the radial nerve.

Lateral dorsal surface of the body of the ulna below the anconeus insertion, from the interosseous membrane, and the middle third of the dorsal surface of the body of the radius.

Radial side of the base of the first metacarpal bone.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

ab·duc·tor pol·li·cis long·us mus·cle

(ab-dŭk'tŏr pol'li-sis long'gŭs mŭs'ĕl)
Outcropping muscle of posterior compartment of forearm; origin, interosseous membrane and posterior surfaces of radius and ulna; insertion, lateral side of base of first metacarpal bone; action, abducts and assists in extending thumb; nerve supply, radial.
Synonym(s): long abductor muscle of thumb, musculus abductor pollicis longus, musculus extensor ossis metacarpi pollicis.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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