Abductor Pollicis Longus

Origin

• Posterior surface of proximal half of Radius and Ulna
• Interosseous Membrane

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Insertion

• Base of Trapezium

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Actions

• Extension and abduction of digit 1 (thumb) at the carpometacarpal joint
• Extension of wrist at radiocarpal joint

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Vascular Supply

• Anterior Interosseous Artery
• Posterior Interosseous Artery

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Nerve

• Posterior Interosseous Nerve (C7-C8) (branch of Radial Nerve)

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Clinical Significance

• De Quervains Tenosynovitis

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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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