Extensor pollicis brevis

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Extensor pollicis brevis
Extensor pollicis muscles.GIF
System: Muscle
Function: Extends the metacarpophalangeal joint of the thumb
Origin: Lower third of posterior surface of radius and adjacent interosseous membrane
Branches:
Insertion: Base of proximal phalanx of the thumb
Arterial supply:
Venous drainage:
Lymphatic drainage:
Innervation: Posterior interosseous nerve (C7, C8)
Vertebral levels:
Search for Extensor pollicis brevis in Gray's.

Extensor pollicis brevis is an extensor of the thumb.

Contents

Surface Anatomy

The tendon of extensor pollicis brevis can be felt and seen at the wrist on extension of the thumb.

Shape

Extensor pollicis brevis lies medially to abductor pollicis longus and is intimately connected to it, its tendon passing in the same groove on the lateral side of the radius.

Actions

Joints Affected

Origin

Insertion

Nerve Supply

Relations

Clinical Relevance

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