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 and adducts the wrist
Antagonist:	Flexor carpi ulnaris
Dorlands /Elsevier	m_22/12548870

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

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

Contents 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.

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.

[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.

[edit] External links

• LUC ecu
• UWASH extensorcarpiulnaris
• Extensor+carpi+ulnaris+muscle at eMedicine Dictionary

v • d • e List of muscles of upper limbs VERTEBRAL COLUMN trapezius - latissimus dorsi - rhomboid (major, minor) - levator scapulae THORACIC WALLS pectoralis major - pectoralis minor - subclavius - serratus anterior SHOULDER deltoid - rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) - teres major ARM anterior compartment: coracobrachialis - biceps brachii - brachialis posterior compartment: triceps brachii - anconeus FOREARM anterior compartment: superf. - pronator teres - palmaris longus - flexor carpi radialis - flexor carpi ulnaris - flexor digitorum superficialis anterior compartment: deep - pronator quadratus - flexor digitorum profundus - flexor pollicis longus posterior compartment: superf. - mobile wad (brachioradialis, extensor carpi radialis longus and brevis) - extensor digitorum, - extensor digiti minimi - extensor carpi ulnaris posterior compartment: deep - supinator - anatomical snuff box (abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus) - extensor indicis HAND lateral volar - thenar (opponens pollicis, flexor pollicis brevis, abductor pollicis brevis) - adductor pollicis medial volar - hypothenar (opponens digiti minimi, flexor digiti minimi brevis, abductor minimi digiti) - palmaris brevis intermediate - lumbrical - interossei (dorsal, palmar)