Extensor Indicis

• O (origin):

  • Posterior aspect of lower ulna
  • Adjacent interosseus membrane

  A) Extensor Indicis

  
• R (direction):

  • Distally

  A) Extensor Indicis

  
• I (insertions):

  • Blends with the extensor hood of the proximal phalanx of the index finger

  A) Extensor Indicis

  
• A (actions):

  • Assists extensor digitorum on index finger
  • Aids wrist extension

  A) Extensor Indicis

  
• NS (nerve supply):

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

  A) Extensor Indicis