abductor pollicis longus

abductor pollicis longus muscle

The Abductor pollicis longus lies immediately below the Supinator and is sometimes united with it. [WP,unvetted].

Tipo Organ
Estructura principal abductor pollicis muscle
Nombre latino abductor pollicis longus muscle
FMA ID 38515

Preguntas frecuentes

What is the abductor pollicis longus?
The abductor pollicis longus (abductor pollicis longus muscle) is a long muscle located in the posterior (extensor) compartment of the forearm. It abducts the thumb at the carpometacarpal joint and also assists with radial deviation of the wrist.
Where is the abductor pollicis longus located?
The abductor pollicis longus lies in the posterior forearm, immediately below the supinator muscle and sometimes partly united with it. Its tendon passes through the first extensor compartment of the wrist alongside the extensor pollicis brevis, traveling obliquely across the wrist to insert at the base of the first metacarpal.
What is the function of the abductor pollicis longus?
The abductor pollicis longus abducts and extends the thumb at the carpometacarpal joint, pulling the thumb away from the hand. It also assists with radial deviation (abduction) of the wrist. This muscle is essential for positioning the thumb for grip.
What conditions can affect the abductor pollicis longus?
De Quervain's tenosynovitis is a common condition where the tendon sheath of the abductor pollicis longus (and extensor pollicis brevis) becomes inflamed, causing pain over the radial (thumb) side of the wrist. This is especially common in new mothers and individuals performing repetitive thumb or wrist movements.
How is the abductor pollicis longus different from the abductor pollicis brevis?
The abductor pollicis longus is an extrinsic forearm muscle with a long tendon reaching the base of the first metacarpal, while the abductor pollicis brevis is an intrinsic hand muscle within the thenar eminence acting on the proximal phalanx of the thumb. They produce complementary abduction at different joints.

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Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.