Extensor carpi radialis longus muscle

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Extensor carpi radialis longus
Extensor carpi radialis longus visible at upper right.
Transverse section across the wrist and digits. (Ext. carp. rad. long. labeled at center left.)
Latin musculus extensor carpi radialis longus
Gray's subject #125 452
Origin: Posterior surface of the forearm. Superficial muscles.
Insertion:
Blood: radial artery
Nerve: Being an extensor contained in the forearm, it is innervated by the radial nerve.
Action:
Dorlands/Elsevier m_22/12548862

Extensor carpi radialis longus is one of the five main muscles that control movement at the wrist.

As the name suggests, this muscle is an extensor at the wrist joint, and travels along the radial side of the arm, so will also abduct the hand at the wrist.

This muscle is quite long, starting on the lateral side of the humerus, and attaching to the base of the 2nd metacarpal.

It initially runs along with brachioradialis, but becomes mostly tendon early on, running between brachioradialis and extensor carpi radialis brevis.

[edit] Details from Gray's anatomy

The Extensor carpi radialis longus (Extensor carpi radialis longior) is placed partly beneath the Brachioradialis.

It arises from the lower third of the lateral supracondylar ridge of the humerus, from the lateral intermuscular septum, and by a few fibers from the common tendon of origin of the Extensor muscles of the forearm.

The fibers end at the upper third of the forearm in a flat tendon, which runs along the lateral border of the radius, beneath the Abductor pollicis longus and Extensor pollicis brevis; it then passes beneath the dorsal carpal ligament, where it lies in a groove on the back of the radius common to it and the Extensor carpi radialis brevis, immediately behind the styloid process. It is inserted into the dorsal surface of the base of the second metacarpal bone, on its radial side.

[edit] External links

Muscles of the HeadNeckTrunkUpper limbLower limbLIST OF ALL MUSCLES

VERTEBRAL COLUMN: trapezius | latissimus dorsi | rhomboid major | rhomboid minor | levator scapulae | (Gray's s121)

ANTERIOR AND LATERAL THORACIC WALLS: pectoralis major | pectoralis minor | subclavius | serratus anterior | (Gray's s122)

SHOULDER: deltoid | rotator cuff (subscapularis, supraspinatus, infraspinatus, teres minor) | teres major | (Gray's s123)

ARM: coracobrachialis | biceps brachii | brachialis | triceps brachii | (Gray's s124)

FOREARM: Volar super. | pronator teres | palmaris longus | flexor carpi radialis | flexor carpi ulnaris | flexor digitorum superficialis
Volar deep | flexor digitorum profundus | flexor pollicis longus | pronator quadratus
Dorsal super. | brachioradialis | extensor digitorum | extensor carpi radialis longus | extensor digiti minimi | extensor carpi radialis brevis | extensor carpi ulnaris | anconeus
Dorsal deep | supinator | abductor pollicis longus | extensor pollicis brevis | extensor pollicis longus | extensor indicis | (Gray's s125)

HAND: Lateral volar | abductor pollicis brevis | thenar (opponens pollicis, flexor 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 | (Gray's s126)