Extensor Pollicis Longus

• O (origin):

  • Posterior aspect of ulna and adjacent interosseous membrane proximal to Extensor Indicis

  A) Extensor Pollicis Longus

  
• R (direction):

  • Distally

  A) Extensor Pollicis Longus

  
• I (insertions):

  • Small triangular expansion into dorsal surface distal phalanx of thumb

  A) Extensor Pollicis Longus

  
• A (action):

  • Extension of all joints of the thumb
  • Assists in extension and radial deviation of wrist

  A) Extensor Pollicis Longus

  
• NS (nerve supply):

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

  A) Extensor Pollicis Longus