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Extensor Carpi Ulnaris
Region: Forearm & Hand Muscles · All forearm & hand muscles
Extensor Carpi Ulnaris at a glance
| Origin | Lateral epicondyle of the humerus and posterior border of the ulna |
|---|---|
| Insertion | Base of the fifth metacarpal |
| Actions | Straightens the wrist (extension); Tilts the hand toward the little-finger side (ulnar deviation) |
| Nerve supply | Posterior interosseous nerve (C7–C8) |
◆ Good to know
Its tendon sits in a groove behind the ulnar head and can snap out of it (subluxation) after wrist injuries, causing a painful click.
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.