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

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.

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.

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.

 This muscle article is a stub. You can help Wikipedia by expanding it.
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: super. - pronator teres - palmaris longus - flexor carpi radialis - flexor carpi ulnaris - flexor digitorum superficialis - deep - pronator quadratus - flexor digitorum profundus - flexor pollicis longus
posterior compartment: super. - mobile wad (brachioradialis, extensor carpi radialis longus and brevis) - extensor digitorum, - extensor digiti minimi - extensor carpi ulnaris - 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 - palmaris brevis - hypothenar (abductor minimi digiti, flexor digiti minimi brevis, opponens digiti minimi)

intermediate - lumbrical - dorsal interossei - palmar interossei
Retrieved from "http://en.wikipedia.org/wiki/Extensor_carpi_ulnaris_muscle"
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