Extensor Indicis Proprius (EIP) Anatomy
Origin: Ulna (posterior surface of shaft) Interosseous membrane
Insertion: 2nd digit (via tendon of extensor digitorum into extensor hood)
Innervation: Cervical root(s): C7 and C8 Nerve: radial nerve (posterior interosseous branch)
EIP Pearls:
Diagrams & Photos
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EIP Anatomy Drawing
Videos
EIP Anatomy Video
Key Points
- The EIP is ulnar and deep to the EDC in section 9 area.