Extensor carpi ulnaris muscle

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Extensor carpi ulnaris

Extensor carpi ulnaris labeled 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
Action:	extends the wrist
Antagonist:	Flexor carpi ulnaris muscle
Dorlands/Elsevier	m_22/12548870

Extensor carpi ulnaris is a muscle located in the forearm of human bodies that acts to extend and adduct the wrist.

Being an extensor muscle, extensor carpi ulnaris is on the posterior side of the forearm.

1 Origin and insertion
2 Action
3 Additional images
4 External links

[edit] 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.

[edit] 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.

[edit] 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.