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Thenar Muscles

  • Introduction
    • the thenar hand muscles include
      • opponens pollicis
      • abductor pollicis brevis
      • flexor pollicis longus
      • mnemonic: "OAF"
    • these muscles are innervated by the median nerve and are involved in fine movements of the thumb
  • Function
    • the thenar hand muscles are involved in
      • opposition
      • abduction
      • flexion
      • mnemonic: "OAF"
  • Function ("OAF")
    • the thenar hand muscles are involved in
      • opposition
      • abduction
      • flexion
  • Muscles ("OAF")
    • opponens pollicis
    • abductor pollicis brevis
    • flexor pollicis brevis
  • Notes
    • thenar muscles form thenar eminence on lateral surface of palm
    • thenar muscles innervated by recurrent branch of median nerve
Hypothenar Muscles
 

 
  • Function ("OAF")
    • oppose
    • abduct
    • flex
  • Muscles ("OAF")
    • opponens digiti minimi
    • abductor digiti minimi
    • flexor digiti minimi
  • Notes
    • hypothenar muscles form hypothenar eminence on medial surface of palm
    • hypothenar muscles innervated by deep branch of ulnar nerve
Interossei and Lumbricals
 


  • Dorsal interosseous muscles
    • abduct the fingers
    • "DAB" = Dorsals ABduct
  • Palmar interosseous muscles
    • adduct the fingers
    • "PAD" = Palmars ADduct
  • Lumbrical muscles
    • flex metacarpophalangeal (MCP) joints
    • extend proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints
 

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