Abductor pollicis longus muscle
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The abductor pollicis longus is a muscle found in the deep posterior compartment of the forearm. As it descends, it becomes superficial and passes under the extensor retinaculum beforeand through the 1st extensor compartment of the wrist before attaching distally.
Summary
- origin: posterior surfaces of ulna, radius and interosseous membrane
- insertion: via tendon, usually dividing into two slips, one attaching to the base of 1st metacarpal, the other attaching to the trapezium
- innervation: posterior interosseous nerve (C7, 8)
- action: abducts and extends the thumb at the carpometacarpal joint
-<p>The <strong>abductor pollicis longus</strong> is a muscle found in the deep posterior compartment of the forearm. As it descends, it becomes superficial and passes under the extensor retinaculum before attaching distally.</p><ul>- +<p>The <strong>abductor pollicis longus</strong> is a muscle found in the deep <a href="/articles/posterior-compartment-of-the-forearm">posterior compartment of the forearm</a>. As it descends, it becomes superficial and passes under the extensor retinaculum and through the 1st <a href="/articles/extensor-compartments-of-the-wrist">extensor compartment of the wrist</a> before attaching distally.</p><h4>Summary</h4><ul>
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