Deep Outcropping Pollicis Muscles

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Last updated 12:19 AM on 7/9/26
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12 Terms

1
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Abductor pollicis longus origin

Proximal halves of ulna, radius, IO membrane

2
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Abductor pollicus longus insertion

Base of metacarpal 1

3
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Abductor pollicis longus innervation

Posterior IO nerve

4
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Abductor pollicis longus action

Abducts, extends thumb

5
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Extensor pollicis brevis origin

Distal third radius/IO membrane

6
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Extensor pollicis brevis insertion

Base of proximal phalanx of thumb

7
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Extensor pollicis brevis innervation

Posterior IO nerve

8
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Extensor pollicis brevis action

Extends proximal phalanx of thumb

9
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Extensor pollicis longus origin

Middle third of ulna/IO membrane

10
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Extensor pollicis longus insertion

Base of distal phalanx of thumb

11
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Extensor pollicis longus innervation

Posterior IO nerve

12
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Extensor pollicis longus action

Extends distal phalanx of thumb and adjacent prox joints