Hand Exam: Motor 10/13 – Extensor Indicis Proprius (EIP) and Extensor Digiti Minimi (EDM)

Extensor Indicis Proprius (EIP)

  • Instruct the patient “Point with your index finger with the rest of your hand in a fist”
  • Insertion: extensor hood of index finger
  • Action: extension of MCP joints and IP joints of the index finger
  • Innervation: posterior interosseous branch of radial nerve

Extensor Digiti Minimi (EDM)

  • Instruct the patient “Stick out your little finger with the other fingers in a fist”
  • Insertion: extensor expansion at the base of the proximal phalanx of the little finger
  • Action: extension of MCP joints and IP joints of the little finger
  • Innervation: posterior interosseous branch of radial nerve
Alternatively you can get the patient to ROCK ON!!!! (testing both EIP and EDM at the same time)

The 13 muscle groups you need to test in the hand exam:

  1. FPL
  2. FDP
  3. FDS
  4. Thenar muscles
  5. Interosseous
  6. Hypothenar muscles
  7. EPB and APL
  8. EPL
  9. EDC
  10. EIP and EDM
  11. ECRL and ECRB
  12. ECU
  13. Adductor Pollicis
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