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Dorsal Interossei (Hand)
Region: Forearm & Hand Muscles · All forearm & hand muscles
Dorsal Interossei (Hand) at a glance
| Origin | Adjacent sides of the metacarpals (two heads each) |
|---|---|
| Insertion | Extensor expansions and bases of the proximal phalanges of the index, middle and ring fingers |
| Actions | Spread the fingers apart (abduction) — 'DAB'; Help bend the knuckles while straightening the finger joints |
| Nerve supply | Ulnar nerve, deep branch (C8–T1) |
◆ Good to know
The first dorsal interosseous (between thumb and index) is the muscle that visibly wastes early in ulnar and motor neurone problems.
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.