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Palmaris brevis muscle

Last revised by Dr Daniel J Bell on 02 Aug 2021

The palmaris brevis muscle, a small intrinsic muscle of the hand, is a quadrangular-shaped subcutaneous muscle that overlies the hypothenar muscles, ulnar artery and superficial branch of the ulnar nerve at the medial side of the palm. Although it overlies the hypothenar group it is not part of it.

Summary

  • origin: palmar aponeurosis and flexor retinaculum
  • insertion: dermis of skin on the medial margin of the hand
  • action: improves grip
  • arterial supply: palmar metacarpal artery of deep palmar arch
  • innervation: superficial branch of the ulnar nerve

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