Extensor Indicis

Parent Structures

• Deep Posterior Muscles of the Forearm

Proximal/Superior Attachment

• Ulna - Lower Part of the Posterior Surface

Distal/Inferior Attachment

• Base of 2nd Middle Phalanx of the Hand - Dorsal Digital Expansion

Joint Actions

• Agonist
  • 2nd Metacarpophalangeal Joint (2nd MCP)
    • Extension
  • DIP of the 2nd Phalanx of the Hand
    • Extension
  • PIP of the 2nd Phalanx of the Hand
    • Extension
  • Wrist
    • Extension - After Index finger fully extended

Nerve Innervation

• Radial Nerve