Hand Exam: Motor 5/13 – Interosseous Muscles

 

Interosseous Muscles: Instruct the patient “Spread your fingers apart”

Palmar Interossei (3) – PAD (Palmars ADduct, bring fingers together)

  • Action: adduction of index, ring and small fingers
  • Innervation: deep branch of ulnar nerve

Dorsal Interossei (4) – DAB (Dorsals ABduct, bring fingers apart)

  • Action: abduction of index, long, ring and small fingers
  • Innervation: deep branch of ulnar nerve

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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