Gordana Sendic It acts on the wrist joint causing extension and abduction (radial deviation) of the hand while powered by the radial nerve. Last reviewed: September 21, 2020. Read more. elbow flexor. Clinically Oriented Anatomy (7th ed.). Extensor carpi radialis longus together with extensor carpi radialis brevis produce wrist extension and abduction (radial deviation). The muscle can be exercised through standard forearm conditioning. This is often due to repetitive movements of the forearm or hand. Read more. Thereby, wrist flexion is prevented and the contraction force produced by the forearm flexors is transferred to the fingers. Deep muscles. the The extensor carpi radialis longus is one of the five main muscles that control movements at the wrist. It arises from the lateral epicondyle of the humerus, by the common extensor tendon; from the radial collateral ligament of the elbow-joint; from a strong aponeurosis which covers its surface; and from the intermuscular septa between it and the adjacent muscles. This muscle is quite long, starting on the lateral side of the humerus, and attaching to the base of the second metacarpal bone. At this level, the tendon of extensor carpi radialis longus is crossed by the tendon of extensor pollicis longus, after which it inserts on the posterior aspect of the base of the second metacarpal bone. It is involved in extending and abducting the hand at the wrist joint. The muscle also plays a role in flexion of the elbow. Weak These two actions are vital for effective hand gripping. forearm fascia, Insertion: Dorsal base of The fibers unite into a muscle belly which extends approximately to the middle of the forearm. A wrist roller can be used and reverse wrist curls with dumbbells can be performed. Healthline Media does not provide medical advice, diagnosis, or treatment. Philadelphia, PA: Lippincott Williams & Wilkins. Edinburgh: Churchill Livingstone. Register now Attachments of the Extensor Carpi Radialis Brevis Muscle: Origin and Insertion. Extensor carpi radialis longus is one of three primary wrist extensors. Posterior surface of the forearm. For more details about extensor carpi radialis longus and other forearm extensors, including labelling diagrams, take a look below: Testing the functions of extensor carpi radialis longus can be performed by extending and abducting the wrist of the patient against resistance, with the forearm in a pronated position. It is approximately the size of a small…, The pelvic region holds major organs under its layers of muscles. This article incorporates text in the public domain from page 452 of the 20th edition of Gray's Anatomy (1918). The extensor carpi radialis longus (or extensor carpi radialis longus muscle, latin: musculus extensor carpi radialis longus) is a long muscle of the forearm that belongs to the lateral muscle group. It is an extensor, and an abductor of the hand at the wrist joint. The radial nerve is a branch of the brachial plexus. One of the most common injuries associated with the extensor carpi radialis longus is known as lateral epicondylitis, or ‘tennis elbow.’ This painful condition occurs when tendons in the elbow have been overworked. 2020 Palastanga, N., & Soames, R. (2012). [2], The fibres end approximately at the middle of the forearm in the form of a flat tendon, which is closely connected with that of the extensor carpi radialis longus, and accompanies it to the wrist; it passes beneath the abductor pollicis longus and extensor pollicis brevis, beneath the extensor retinaculum, and inserts into the lateral dorsal surface of the base of the third metacarpal bone, with a few fibres inserting into the medial dorsal surface of the second metacarpal bone. Origin (proximal attachment) a. Lateral epicondyle of humerus. document.write(footer2_s) Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. The movement is usually directed backward, with the notable exception of the knee joint. The radial artery delivers oxygenated blood to the muscle. Both tendons course towards the radial styloid process, deep to the tendons of abductor pollicis longus and extensor pollicis brevis muscles. Ventricles, meninges and blood vessels of the brain, Lateral supracondylar ridge of humerus, lateral intermuscular septum of arm, Posterior aspect of base of metacarpal bone 2, Wrist joints: Hand extension, hand abduction (radial deviation), Radial recurrent artery, radial collateral artery, radial artery.