Palmaris Longus Anatomy

Palmaris Longus Muscle

Origin:  Medial epicondyle of the humerus via the common flexor tendon
Insertion:  Central portion of the flexor retinaculum and superficial portion of the palmar aponeurosis
Actions: Assists with flexion of the wrist
Innervation: Median nerve (C7, C8)
Blood Supply: Muscular branches from the ulnar artery

Primary Actions of the Palmaris Longus

1. Because of the size and location the palmaris longus does not have a primary action.

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Secondary Actions of the Palmaris Longus

1. Assists with flexion of the wrist

  Agonists:

  • Flexor Carpi Radialis
  • Flexor Carpi Ulnaris

  Antagonists:

  • Extensor Carpi Radialis Longus
  • Extensor Carpi Radialis Brevis
  • Extensor Carpi Ulnaris

2. Tightens the palmar facsia