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Extensor Indicis
Region: Forearm & Hand Muscles · All forearm & hand muscles
Extensor Indicis at a glance
| Origin | Back surface of the ulna and the interosseous membrane |
|---|---|
| Insertion | Extensor expansion of the index finger |
| Actions | Straightens the index finger independently (pointing) |
| Nerve supply | Posterior interosseous nerve (C7–C8) |
◆ Good to know
Its independent tendon lets you point with the index finger while keeping the other fingers fisted.
More Forearm & Hand Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.