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Post compartment
superficial layer
| muscle | origin | insertion | innervation | action |
|---|---|---|---|---|
| EDC | – Lateral epicondyle | extensor hood – triangular shaped connective tissue and into the base of the dorsal surface of middle and distal phalanges of medial 4 fingers | Radial | MCP Extension |
| EDM | Lateral epicondyle | digital expansion of SF | Radial | SF extension |
| ECU | Lateral epicondyle | base of 5th metacarpal | Radial | wrist extension and ulnar deviation |
| BR | Lateral supracondylar ridge of humerus | Styloid process of radius | Radial | Flex elbow when forearm is in neutral |
| ECRL | lateral supracondylar ridge and lateral epicondyle | base of 2nd metacarpal | Radial | Strong wrist extensor |
| ECRB | lateral epicondyle | base of 3rd metacarpal | Radial | Strong wrist extensor |