Abductor Pollicis Longus

• O (origin):

  • Posterior aspect of ulna, inferior to anconeus
  • Interosseus membrane
  • Middle 1/3 of radius

  A) Abductor Pollicis Longus

  
• R (direction):

  • Distally

  A) Abductor Pollicis Longus

  
• I (insertions):

  • Lateral side of base of 1st metacarpal
  • Additional slip to trapezium

  A) Abductor Pollicis Longus

  
• A (action):

  • Abduction of 1st carpometacarpal joint

  A) Abductor Pollicis Longus

  
• NS (nerve supply):

  • Posterior interosseous branch of radial nerve (C5 - T1)

  A) Abductor Pollicis Longus