Skip to content

Interossei dorsales



  • Deep


  • Surface of 1-5 metacarpal


  • The muscles are passing the MCP-joints flexor side. After passing here they attach to the base of proximal phalanx  until they continue into the fingers dorsal digital expansion

Main function

  • Fingers 2-4 MCP
    • Abduction

Secondary function

  • Fingers 2-4 MCP
    • Flexion
  • Fingers 2-4 IP
    • Extension

Nerve innervation

  • Segmental
    • C8-Th1
  • Peripheral
    • Ulnar nerve

Arterial supply

  • Radial artery
  • Ulnar artery


  • Patient position
    • Sitting or supine
  • The muscle is easily palpatable in the area between the index finger and the thumb
  • Feel for contraction in this area while you have the patient:
    • Keep the index finger in an abducted position
    • Give resistance in the direction of adduction so that the patient generates force into abduction
      • Feel for contraction during this activity