Abductor Pollicis Brevis

• Abductor Pollicis Brevis:

  • Most lateral and superficial muscle of thenar eminence

  
• O (origin):

  • Flexor retinaculum
  • Tubercles of scaphoid and trapezium

  A) Abductor Pollicis Brevis

  
• R (direction):

  • Distally

  A) Abductor Pollicis Brevis

  
• I (insertion):

  • Lateral side of base of proximal phalanx of thumb

  A) Abductor Pollicis Brevis

  
• A (action):

  • Abducts the thumb at carpometacarpal and metacarpophalangeal joints

  A) Abductor Pollicis Brevis

  
• NS (nerve supply):

  • Recurrent (lateral) branch median nerve (C5 - T1)

  A) Abductor Pollicis Brevis