Palmaris Longus

Written by Oliver Jones

Last updated October 5, 2022 • 4 Revisions

The palmaris longus is a muscle within the superficial compartment of the anterior forearm. It is absent in approximately 15% of the population.

  • Attachments: Originates from the medial epicondyle, attaches to the flexor retinaculum of the wrist.
  • Actions: Flexion (weak) at the wrist.
  • Innervation: Median nerve.
  • Blood supply: Ulnar artery.

Fig 1
The superficial muscles of the anterior forearm.

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