Palmaris longus muscle

The palmaris longus muscle is a muscle in the forearm that flexes the wrist.

Origin
The palmaris longus originates from the humerus at the elbow on the common flexor origin of the medial epicondyle.

Insertion
The palmaris longus inserts into the wrist on the flexor retinaculum and the palmar aponeurosis.

Action
The palmaris longus assists in flexing the wrist and tenses the palmar aponeurosis.

Innervation
The palmaris longus is innervated by the medial and lateral cords of the median nerve (C7 and C8).