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Flexor Pollicis Longus
Region: Forearm & Hand Muscles · All forearm & hand muscles
Flexor Pollicis Longus at a glance
| Origin | Front surface of the radius and the interosseous membrane |
|---|---|
| Insertion | Base of the distal phalanx of the thumb |
| Actions | Bends the thumb tip (interphalangeal joint); Helps bend the other thumb joints |
| Nerve supply | Anterior interosseous nerve (median, C8–T1) |
◆ Good to know
The only flexor of the thumb tip; the 'OK sign' test checks it together with extensor pollicis longus — weakness of its nerve flattens the 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.