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Abductor Pollicis Brevis
Region: Forearm & Hand Muscles · All forearm & hand muscles
Abductor Pollicis Brevis at a glance
| Origin | Flexor retinaculum and the scaphoid and trapezium |
|---|---|
| Insertion | Lateral side of the base of the proximal phalanx of the thumb |
| Actions | Moves the thumb away from the palm, at right angles to it (palmar abduction) |
| Nerve supply | Median nerve, recurrent branch (C8–T1) |
◆ Good to know
The main muscle of the thenar eminence tested after carpal tunnel problems: its weakness flattens the thumb pad and weakens pinch.
More Forearm & Hand Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.