Extensor pollicis longus muscle
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Extensor Pollicis Longuspollicis longus (EPL) is a muscle in the posterior compartment of the forearm. The EPL defines the ulnar border of the anatomic snuff box.
Summary
- origin: posterior surface of the middle 1/3 of the ulna and interosseous membrane
- insertion: posterior surface of the base of the distal phalanx of thumb
-
innervation:
Posteriorposterior interosseous nerve (C7 and C8), a continuation of the deep branch of the radial nerve (C7, C8) -
action:
Extendsextends the thumb at the carpometacarpal and interphalangeal joints, and partially adducts 1st metacarpal Injury:
Related pathology
Tenosynovitis, common after activities such as drum playing.
-<p><strong>Extensor Pollicis Longus (EPL)</strong> is a muscle in the posterior compartment of the forearm. The EPL defines the ulnar border of the <a href="/articles/anatomic-snuff-box">anatomic snuff box</a>.</p><h4>Summary</h4><ul>- +<p><strong>Extensor pollicis longus (EPL)</strong> is a muscle in the posterior compartment of the forearm. The EPL defines the ulnar border of the <a href="/articles/anatomic-snuff-box">anatomic snuff box</a>.</p><h4>Summary</h4><ul>
-<strong>innervation:</strong> Posterior interosseous nerve (C7 and C8), a continuation of the deep branch of the radial nerve (C7, C8)</li>- +<strong>innervation:</strong> posterior interosseous nerve (C7 and C8), a continuation of the deep branch of the radial nerve (C7, C8)</li>
-<strong>action:</strong> Extends the thumb at the carpometacarpal and interphalangeal joints, and partially adducts 1st metacarpal</li>-<li>Injury: Tenosynovitis, common after activities such as drum playing.</li>-</ul>- +<strong>action:</strong> extends the thumb at the carpometacarpal and interphalangeal joints, and partially adducts 1st metacarpal</li>
- +</ul><h4>Related pathology</h4><p>Tenosynovitis, common after activities such as drum playing.</p>
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