Extensor Pollicis Longus Muscle

Description

Illustration of the Extensor Pollicis Longus muscle

Alternative Names

• Extensor Pollicis Longus (EPL)
• EPL Muscle
• Long Extensor of the Thumb
• Long Thumb Extensor
• Deep Thumb Extensor Muscle
• Posterior Forearm Thumb Extensor

Origin

• Posterior surface of middle 1/3 of Ulna
• Interosseous Membrane of the Forearm

Insertion

• Posterior surface of base of distal phalanx of digit 1 (thumb)

Actions

• Extension of digit 1 (thumb) at the metacarpophalangeal joints, interphalangeal joint
• Wrist extension (weak)

Vascular Supply

• Posterior Interosseous Artery
• Anterior Interosseous Artery

Nerve

• Posterior Interosseous Nerve

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Clinical Significance

• Drummers Palsy
• Third Dorsal Compartment of the Wrist Injection
• Anatomic Snuffbox

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See Also

• Physical Exam Hand
• Hand Pain (Main)
• Physical Exam Wrist
• Wrist Pain (Main)
• Physical Exam Forearm
• Forearm Pain (Main)
• Hand And Wrist Anatomy

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