Muscle
Extensor indicis
Independent index extensor
High-yield
Independent extension of the index finger (its tendon lies medial to extensor digitorum's); posterior interosseous nerve.
Overview
A deep extensor giving the index finger its own extensor tendon, allowing pointing. Supplied by the posterior interosseous nerve.
Reference facts
- Origin
Posterior surface of the ulna and interosseous membrane
- Insertion
Extensor expansion of the index finger
- Action
Extends the index finger and assists wrist extension
- Innervation
Posterior interosseous nerve (C7, C8)
- Blood supply
Posterior interosseous artery