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Extensor Carpi Radialis Longus and Brevis: Name the action, origin, insertion
- A: Extend and abduct the wrist (radiocarpal joint)
- O: Longus: Distal one-third of the lateral supracondylar ridge of humerus
- Brevis: Common extensor tendon from the lateral epicondyle of humerus
- I: Longus: Base of 2nd metacarpal
- Brevis: Base of third metacarpal
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Extensor Carpi Ulnaris: Name action, origin, insertion
- A: Extend and adduct the wrist
- O: Common extensor tendon from the lateral epicondyle of humerus
- I: Base of 5th metacarpal
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Extensor Digitorum: Name action, origin, insertion
- A: Extend the 2nd-5th fingers
- O: common extensor tendon from the lateral epicondyle of humerus
- I: Bases of middle and distal phalanges of 2nd-5th fingers
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Extensor Pollicis Longus and Brevis: Name action, origin, insertion
- A: Extend the thumb
- O: Longus: Posterior surface of ulna and interosseus membrane
- Brevis: (short) Posterior surface of radius and interosseous membrane
- I: Longus: Base of distal phalanx of thumb
- Brevis: Base of proximal phalanx of thumb
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