The ring finger slip of EDC is often the largest of the four slips and is most involved in junctura tendinum tears.
| Origin | Lateral epicondyle, common extensor origin |
|---|---|
| Insertion | Dorsal expansion of the ring finger |
| Nerve Supply | Posterior interosseous nerve (C7, C8) |
| Blood Supply | Posterior interosseous artery |
| Actions |
|
|---|
It extends the ring finger at the MCP joint, although its connections to adjacent tendons limit fully independent ring finger extension.
The junctura tendinum between ring and little EDC means isolated ring slip laceration may be masked. Rupture at the lateral epicondyle is part of tennis elbow pathology.
Tested by resisted ring MCP extension with adjacent fingers held in flexion.
Ring slip laceration masked by junctura tendinum, identified by testing ring extension with middle finger passively flexed.
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