Palmaris longus muscle
The palmaris longus is a muscle visible as a small tendon located between the flexor carpi radialis and the flexor carpi ulnaris, although it is not always present. It is absent in about 14 percent of the population; this number can vary in African, Asian, and Native American populations, however. Absence of the palmaris longus does not have an effect on grip strength. The lack of palmaris longus muscle does result in decreased pinch strength in fourth and fifth fingers. The absence of palmaris longus muscle is more prevalent in females than males.
| Palmaris longus muscle | |
|---|---|
Palmaris longus tendon as seen in surface anatomy | |
| Details | |
| Origin | medial epicondyle of humerus (common flexor tendon) |
| Insertion | palmar aponeurosis and flexor retinaculum of the hand |
| Artery | ulnar artery |
| Nerve | median nerve |
| Actions | wrist flexor |
| Antagonist | Extensor carpi radialis brevis, Extensor carpi radialis longus, Extensor carpi ulnaris |
| Identifiers | |
| Latin | musculus palmaris longus |
| Greek | Μακρύς παλαμικός μυς |
| TA98 | A04.6.02.029 |
| TA2 | 2482 |
| FMA | 38462 |
| Anatomical terms of muscle | |
The palmaris longus muscle can be seen by touching the pads of the fourth finger and thumb and flexing the wrist. The tendon, if present, will be visible in the midline of the anterior wrist.
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