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Interossei palmares


General information

  • Consists of 3 unipennate muscles that are markedly more weak than the dorsal ones and is positioned palmar on the metacarpal bones


  • Deep


  • Ulnar surface of 2.metacarpal
  • Radial surface of 4.metacarpal
  • Radial surface of 5.metacarpal


  • Base of proximal phalanx at 2, 4 and 5th finger
  • All insertion are attached on the side which is closest to the middle finger

Main function

  • Finger 2, 4, 5 MCP
    • Adduction

Secondary function

  • Finger 2, 4, 5 MCP
    • Flexion
  • Finger 2, 4, 5 IP
    • Extension

Nerve innervation

  • Segmental
    • C8-Th1
  • Peripheral
    • Ulnar nerve

Arterial supply

  • Radial artery
  • Ulnar artery


  • Patient position
    • Sitting or supine
  • Ask your patient to hold a pen or similar object between their index and middle finger
  • Ask the patient to squeeze the pen between the fingers while you feel for contraction in the muscle
  • The same procedure can also be performed for the other parts of the palmar interossei muscles