Extensor carpi ulnaris muscle

Extensor carpi ulnaris muscle
Extensor carpi ulnaris
Extensor carpi ulnaris muscle.png
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 the posterior interosseus nerve, a branch of the radial nerve
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

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.


Extensor carpi ulnaris muscle

Action

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

Despite its name, the extensor carpi ulnaris is innervated by the posterior interosseous branch of the radial nerve. It would therefore be paralyzed in an injury to the posterior cord of the brachial plexus.[1]

Additional images

Bones of left forearm. Posterior aspect.  
Bones of the left hand. Dorsal surface.  
Cross-section through the middle of the forearm.  
Posterior surface of the forearm. Deep muscles.  
Transverse section across distal ends of radius and ulna.  
Transverse section across the wrist and digits.  
The mucous sheaths of the tendons on the back of the wrist.  
Extensor carpi ulnaris muscle  

External links

References

  1. ^ Chung, K (1995). BRS: Gross Anatomy. 
    Moore, K; Agar, A (2002). Essential Clinical Anatomy (2nd ed.). Lippincott. 

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Look at other dictionaries:

  • extensor carpi ulnaris muscle — musculus extensor carpi ulnaris …   Medical dictionary

  • Flexor carpi ulnaris muscle — Muscle infobox Name = Flexor carpi ulnaris Latin = musculus flexor carpi ulnaris GraySubject = 125 GrayPage = 447 Caption = Dorsal (left) and ventral (right) views of deep muscles of the forearm. FCU is visible in blue. Caption2 = Origin = medial …   Wikipedia

  • humeral head of extensor carpi ulnaris muscle — caput humerale musculi extensoris carpi ulnaris …   Medical dictionary

  • ulnar head of extensor carpi ulnaris muscle — caput ulnare musculi extensoris carpi ulnaris …   Medical dictionary

  • extensor carpi ulnaris — extensor carpi ul·nar·is .əl nar əs n a muscle on the ulnar side of the back of the forearm that extends and adducts the hand …   Medical dictionary

  • caput humerale musculi extensoris carpi ulnaris — [TA] the humeral head of the extensor carpi ulnaris muscle, arising from the lateral epicondyle of the humerus …   Medical dictionary

  • caput ulnare musculi extensoris carpi ulnaris — [TA] the ulnar head of the extensor carpi ulnaris muscle, arising from the posterior border of the ulna …   Medical dictionary

  • vagina tendinis musculi extensoris carpi ulnaris — [TA] the tendon sheath enclosing the tendon of the extensor carpi ulnaris muscle, passing into the hand along the medial side of the wrist …   Medical dictionary

  • musculus extensor carpi ulnaris — [TA] ulnar extensor muscle of wrist (2 heads): origin, CAPUT HUMERALE—lateral epicondyle of humerus, CAPUT ULNARE—posterior border of ulna; insertion, base of fifth metacarpal bone; innervation, deep branch of radial; action, extends and… …   Medical dictionary

  • Flexor carpi radialis muscle — Infobox Muscle Name = PAGENAME Latin = musculus flexor carpi radialis GraySubject = 125 GrayPage = 446 Caption = Front of the left forearm. Superficial muscles. (Flexor carpi radialis and its tendon visible in blue.) Caption2 = Front of right… …   Wikipedia

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