Name
Pronunciation
(par-MA-rus LONG-gus)
Origin/Proximal Attachment
Medial epicondyle of the humerus via the common flexor tendonAntebrachial Fascia
Insertion/Distal Attachment
Central portion of the flexor retinaculum; superficial portion of the palmar aponeurosis
Action/Relevance
Flexes the hand at the wrist
Innervation
Median nerve (C6, 7)
Notes
Palmaris longus arises from the common flexor origin around the medial epicondyle. It is inserted into the tough fascia of the palmar aponeurosis and the flexor retinaculum.
The action of palmaris longus is to flex the wrist and tense the palmar aponeurosis.
It is supplied by the median nerve (C7, C8).
It is absent in approximately 13% of the population.