Extensor pollicis longus muscle
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Extensor pollicis longus(EPL) is a muscle in in the posterior compartment of the forearm. TheIt passes through the 3rd extensor compartment of the wrist, where it changes direction around Lister's tubercle. 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
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innervation:
posteriorposterior interosseous nerve (C7 and C8), a continuation of the deep branch of the radial nerve (C7, C8) - action: extends the thumb at the carpometacarpal and interphalangeal joints, and partially adducts 1st metacarpal
Related pathology
Tenosynovitis
- distal intersection syndrome
- EPL 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 <a href="/articles/posterior-compartment-of-the-forearm">posterior compartment of the forearm</a>. It passes through the 3rd <a href="/articles/extensor-compartments-of-the-wrist">extensor compartment of the wrist</a>, where it changes direction around Lister's tubercle. The EPL defines the ulnar border of the <a href="/articles/anatomic-snuff-box">anatomic snuff box</a>. </p><h4>Summary</h4><ul>
-<strong>origin: </strong>posterior surface of the middle 1/3 of the ulna and interosseous membrane</li>- +<strong>origin: </strong>posterior surface of the middle 1/3 of the <a href="/articles/ulna">ulna</a> and interosseous membrane</li>
-<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> <a href="/articles/posterior-interosseous-nerve">posterior interosseous nerve</a> (C7 and C8), a continuation of the deep branch of the <a href="/articles/radial-nerve">radial nerve</a> (C7, C8)</li>
-<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>- +<strong>action:</strong> extends the thumb at the <a href="/articles/carpometacarpal-joint">carpometacarpal</a> and <a href="/articles/interphalangeal-joint-of-the-hands">interphalangeal joints</a>, and partially adducts 1st metacarpal</li>
- +</ul><h4>Related pathology</h4><ul>
- +<li><a href="/articles/distal-intersection-syndrome">distal intersection syndrome</a></li>
- +<li>EPL tenosynovitis, common after activities such as drum playing.</li>
- +</ul>
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