Extensor Digitorum

Parent Structures

• Superficial Posterior Muscles of the Forearm

Proximal/Superior Attachment

• Lateral Epicondyle - Common Extensor Tendon

Distal/Inferior Attachment

• Base of 2nd Middle Phalanx of the Hand - Dorsal Aspect
• Base of 3rd Middle Phalanx of the Hand - Dorsal Aspect
• Base of 4th Middle Phalanx of the Hand - Dorsal Aspect
• Base of 5th Middle Phalanx of the Hand - Dorsal Aspect

Joint Actions

• Agonist
  • 2nd Metacarpophalangeal Joint (2nd MCP)
    • Extension
  • 3rd Metacarpophalangeal Joint (3rd MCP)
    • Extension
  • 4th Metacarpophalangeal Joint (4th MCP)
    • Extension
  • 5th Metacarpophalangeal Joint (5th MCP)
    • Extension
  • DIP of the 2nd Phalanx of the Hand
    • Extension
  • DIP of the 3rd Phalanx of the Hand
    • Extension
  • DIP of the 4th Phalanx of the Hand
    • Extension
  • DIP of the 5th Phalanx of the Hand
    • Extension
  • PIP of the 2nd Phalanx of the Hand
    • Extension
  • PIP of the 3rd Phalanx of the Hand
    • Extension
  • PIP of the 4th Phalanx of the Hand
    • Extension
  • PIP of the 5th Phalanx of the Hand
    • Extension
  • Wrist
    • Extension

Nerve Innervation

• Radial Nerve