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Palmaris longus

The palmaris longus (or palmaris longus muscle, latin: musculus palmaris longus) is a long, flat, superficial muscle of the forearm that belongs to the anterior muscle group and lies in the first layer.

Origin

The palmaris longus originates from the medial epicondyle of the humerus.

Insertion

The palmaris longus descends obliquely and ends in a flattened tendon that passes over the flexor retinaculum and inserts into the palmar aponeurosis.

Action

The main function of the palmaris longus is flexion of the hand.

Innervation

The palmaris longus is innervated by the median nerve.