Palmaris longus
Arms
- Origin
- Medial epicondyle of the humerus
- Insertion
- Flexor retinaculum and palmar aponeurosis
- Action
- Tenses the palmar aponeurosis and assists wrist flexion
- Nerve supply
- Median nerve (C7–C8)
A slender muscle with a long tendon running to the palm. It is missing on one or both sides in a noticeable share of people, and the wrist works normally without it.