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| Extensor carpi ulnaris | |
|---|---|
| Posterior surface of the forearm. Extensor carpi ulnaris labeled in purple at center right. | |
| Latin | musculus extensor carpi ulnaris |
| Gray's | subject #125 454 |
| Origin | Common extensor tendon (lateral epicondyle), ulna |
| Insertion | 5th metacarpal |
| Artery | ulnar artery |
| Nerve | Deep branch of the radial nerve (C7, C8) |
| Actions | extends and adducts the wrist |
| Antagonist | Flexor carpi ulnaris |
In human anatomy, the extensor carpi ulnaris is a skeletal muscle located on the ulnar side of the forearm. It acts to extend and adduct at the carpus/wrist.
Being an extensor muscle, extensor carpi ulnaris is on the posterior side of the forearm.
Contents |
Origin and insertion [edit]
It originates from the lateral epicondyle of the humerus and the posterior border of the ulna, and crosses the forearm to the ulnar (medial) side to insert at the base of the 5th metacarpal.
Action [edit]
The extensor carpi ulnaris extends the wrist, but when acting alone inclines the hand toward the ulnar side; by its continued action it extends the elbow-joint.
The muscle is a minor extensor of the carpus in carnivores, but has become a flexor in ungulates. In this case it is described as ulnaris lateralis.
Innervation [edit]
Despite its name, the extensor carpi ulnaris is innervated by the deep branch of the radial nerve.[1] It would therefore be paralyzed in an injury to the posterior cord of the brachial plexus.[2][3]
Injuries [edit]
A common injury to the extensor carpi ulnaris is tennis elbow. This injury occurs in people that participate in activities requiring repetitive arm, elbow, and wrist, especially then they are tightly gripping an object. Some symptoms include pain when shaking hands or squeezing an object. The pain worsens when a person moves their wrist with force. The pain intensifies because the extensor carpi ulnaris has an injury near the elbow area and as a person moves their arm, the muscle contracts, thus causing it to move over the lateral epicondyle of the humerus. This causes irritation to the already existing injury. Some treatments for tennis elbow include physical therapy, anti-inflammatory medication, and rest from the activity that caused the injury.[4][5]
Additional images [edit]
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External links [edit]
References [edit]
- ^ Clinically oriented anatomy. [S.l.]: Lippincott Williams & Wil. 2009. p. 751. ISBN 978-1-6083-1181-1.
- ^ Chung, K (1995). BRS: Gross Anatomy.
- ^ Moore, K; Agar, A (2002). Essential Clinical Anatomy (2nd ed.). Lippincott.
- ^ Nirschl, RP (October 1992). "Elbow Tendinosis/tennis Elbow". Clin Sports Med. 11 (4): 851–70. PMID 1423702.
- ^ Saladin, Kenneth S. Anatomy and Physiology: The Unity and Form of Function (5th ed.). ISBN 9780077396336.[page needed]
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