Extensor Digitorum

• O (origin):

  • Common extensor origin

  A) Extensor Digitorum

  
• R (direction):

  • 4 tendons run distally and pass deep to extensor retinaculum

  A) Extensor Digitorum

  
• I (insertions):

  • Extensor hood (DDE) on dorsum of medial 4 fingers

  A) Extensor Digitorum

  
• A (actions):

  • Extension of metacarpophalangeal and wrist joints
  • May contribute to extension of interphalangeal joints

  A) Extensor Digitorum

  
• NS (nerve supply):

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

  A) Extensor Digitorum