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Extensor pollicis longus muscle

from Latin: pollex - thumb
Synonym: long thumb extensor
German: Musculus extensor pollicis longus

1 Definition

The extensor pollicis longus muscle belongs to the deep layer of the forearm extensors.

2 Devolution

The origin of the muscle lies in the posterior surface of the ulna and in the interosseous membrane of the forearm. Its tendon pierces the 3rd tendon compartment of the extensor retinaculum and inserts in the distal phalanx of the thumb.

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3 Innervation

Its innervation is provided by the profound branch of the radial nerve, with fibers from the C7 and C8 segments.

4 Function

The extensor pollicis longus muscle effects an extension and abduction of the thumb.

Specialties: Anatomy

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