Flexor pollicis longus muscle
The flexor pollicis longus (/ˈflɛksər ˈpɒlɪsɪs ˈlɒŋɡəs/; FPL, Latin flexor, bender; pollicis, of the thumb; longus, long) is a muscle in the forearm and hand that flexes the thumb. It lies in the same plane as the flexor digitorum profundus. This muscle is unique to humans, being either rudimentary or absent in other primates. A meta-analysis indicated accessory flexor pollicis longus is present in around 48% of the population.
| Flexor pollicis longus muscle | |
|---|---|
Front of the left forearm. Deep muscles. (Flexor pollicis longus is shown in purple) | |
| Details | |
| Origin | The middle 1/2 of the anterior surface of the radius and the adjacent interosseus membrane. |
| Insertion | The base of the distal phalanx of the thumb |
| Artery | Anterior interosseous artery |
| Nerve | Anterior interosseous nerve (branch of median nerve) (C8, T1) |
| Actions | Flexion of the thumb. |
| Antagonist | Extensor pollicis longus muscle, Extensor pollicis brevis muscle |
| Identifiers | |
| Latin | musculus flexor pollicis longus |
| TA98 | A04.6.02.037 |
| TA2 | 2492 |
| FMA | 38481 |
| Anatomical terms of muscle | |
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