Athena Vale
Extensor Carpi Radialis Longus (ECRL) is a muscle found in the posterior compartment of the forearm. It is one of three primary wrist extensors and is most effective when the elbow is extended. The muscle is most visible when the forearm is half pronated and flexing at the elbow against resistance. The extensor tendons enter the dorsum of the hand via six extensor tendon compartments covered by the extensor retinaculum. The extensor digitorum is the main extensor of the fingers.
| Characteristics | Values |
|---|---|
| Muscle | Extensor Carpi Radialis Longus (ECRL) |
| Location | Posterior compartment of the forearm |
| Function | Wrist extension and abduction (radial deviation), elbow flexion, fist clenching, gripping |
| Innervation | Radial nerve (C6-C8) |
| Attachments | Originates from the lateral supracondylar ridge of the humerus, attaches to the distal end of the radius before the radial styloid process |
| Layers | Deep and superficial layers, with the extensor muscles in the deep layer |
| Tendon | Forms a flattened tendon that runs distally over the lateral surface of the radius |
Explore related products
What You'll Learn
Extensor Carpi Radialis Longus (ECRL)
The extensor carpi radialis longus (ECRL) is a muscle in the forearm that helps control wrist movements. It is one of the five main muscles that control movements at the wrist. The ECRL is a particularly long muscle that is attached at the base of the humerus on one end and the second metacarpal bone on the other end. It is in the same muscle family as the extensor carpi radialis brevis (ECRB). Both muscles need to be strong to move the arm, wrist, and hand appropriately.
The ECRL is one of three primary wrist extensors. It is most effective as a wrist extensor when the elbow is extended and when radial deviation is balanced by the primary ulnar deviator- extensor carpi ulnaris. Functionally, the wrist extensors work strongly in the action of gripping, together with extensor carpi ulnaris. By keeping the wrist in extension, flexion of the wrist by flexors digitorum superficialis and profundus is prevented, with the result that these muscles act on the fingers.
The ECRL is a fusiform muscle that forms a flattened tendon that runs distally over the lateral surface of the radius. In the lower third of the forearm, the tendon is crossed by the tendons of abductor pollicis brevis and extensor pollicis brevis. The tendons of ECRL and ECRB pass deep into the extensor retinaculum in a common synovial sheath. Together, they groove the posterior surface of the styloid process of the radius.
The best exercises to improve strength in the ECRL are exercises that require you to move your wrist, hands, elbows, and forearms. Some examples include holding your arm out straight and gently pulling back on your fingertips, holding a weight in your hand and slowly lifting it toward your chest, and getting down on your hands and knees and performing a push-up motion.
Building Defined Muscles: Strategies for Success
You may want to see also
Explore related products
![Carpal Tunnel Wrist Brace Night Support and Metal Splint Stabilizer [Single] - Helps Relieve Tendinitis Arthritis Carpal Tunnel Syndrome Pain - Reduces Recovery Time for Men Women - Right (S/M)](https://m.media-amazon.com/images/I/91GWFXSlKZL._AC_UL320_.jpg)
Extensor Carpi Radialis Brevis (ECRB)
The ECRB and ECRL work together to produce wrist extension and abduction (radial deviation). They may also play a role in flexing the elbow joint and are active during fist clenching. These muscles function most effectively as wrist extensors when the elbow is extended and radial deviation is balanced by the primary ulnar deviator, Extensor Carpi Ulnaris. Additionally, the wrist extensors strongly contribute to the action of gripping, working in conjunction with Extensor Carpi Ulnaris.
The tendons of the ECRB and ECRL pass deep to the extensor retinaculum in a common synovial sheath and groove the posterior surface of the styloid process of the radius. The ECRB tendon inserts on the dorsal base of the third metacarpal, while the ECRL tendon inserts on the base of the second metacarpal.
In terms of variations, a unique case has been reported of an accessory tendon arising from the ECRL and travelling with the primary tendon through the second compartment of the extensor retinaculum. This accessory tendon inserted on the base of the third metacarpal, which is typically where the ECRB tendon inserts. Additionally, bilateral agenesis of the ECRB has been reported, which refers to the absence or failure of development of the muscle.
Understanding Your Lumbar Muscles: Their Function and Anatomy
You may want to see also
Explore related products
Extensor Carpi Ulnaris (ECU)
ECU originates from the lateral epicondyle of the humerus, the radial collateral ligament, and the posterior border of the ulna. It crosses the forearm to the ulnar (medial) side to insert at the base of the 5th metacarpal on the posterior surface. The muscle is supplied by the radial recurrent artery and the posterior interosseous artery. The ECU is innervated by the posterior interosseous nerve (C7 and C8), a continuation of the deep branch of the radial nerve (C7, C8).
ECU acts to extend and adduct at the carpus/wrist from the anatomical position. It extends the wrist, but when acting alone, inclines the hand toward the ulnar side. The continued action of the ECU extends the elbow joint. ECU injuries are common in people who participate in activities requiring repetitive arm, elbow, and wrist movements, especially when tightly gripping an object. Some symptoms of an ECU injury include pain when shaking hands or squeezing/gripping an object. The pain worsens when the wrist is moved with force.
Diagnosis of ECU injury is made through imaging techniques such as CT, MRI, musculoskeletal ultrasound, or ultrasound imaging. Treatment of ECU injuries depends on the severity of the injury. Conservative treatments include immobilization and stabilization of the affected wrist by placing it in a cast. Steroid injections and surgical procedures are considered when conservative treatments are ineffective or if the injury is too severe.
Lifting Weights: Preventing Muscle Loss and Staying Strong
You may want to see also
Explore related products
Extensor Digitorum
The extensor digitorum muscle, also known as the extensor digitorum communis, is a muscle in the superficial layer of the posterior compartment of the forearm. It is one of the extrinsic muscles of the hand. The extensor digitorum is the most superficial muscle of the posterior forearm, located above the abductor pollicis longus and extensor pollicis longus muscles. These three muscles enclose a tunnel through which the posterior interosseous artery and nerve pass.
The extensor digitorum is innervated by the posterior interosseous nerve, which is a branch of the radial nerve. It arises from the lateral epicondyle of the humerus, by the common tendon; from the intermuscular septa between it and the adjacent muscles, and from the antebrachial fascia. The extensor digitorum is vascularized by the branches of three different arteries: the anterior and posterior interosseous arteries, which are branches of the common interosseus artery that arises from the ulnar artery, and the radial recurrent artery, which is a branch of the radial artery.
The extensor digitorum extends the phalanges, the wrist, and the elbow. It also separates the fingers as it extends them. In the fingers, the extensor digitorum acts principally on the proximal phalanges, extending the metacarpophalangeal joint. The extension of the proximal and distal interphalangeal joints is mediated predominantly by the dorsal and palmar interossei and lumbricals of the hand. The extensor digitorum is responsible for the extension of the four medial fingers in their metacarpophalangeal and both interphalangeal joints. This muscle is involved in the anatomy of the grip as it contributes to the opening of the hand and letting go of an object.
The tendon of the extensor digitorum divides into four tendons in the distal forearm, which pass through a separate compartment of the dorsal carpal ligament within a mucous sheath. The tendons diverge on the back of the hand and are inserted into the middle and distal phalanges of the fingers. Opposite the metacarpophalangeal articulation, each tendon is bound by fasciculi to the collateral ligaments and serves as the dorsal ligament of this joint.
Adderall's Impact: Can It Shrink Muscles?
You may want to see also
Explore related products
Extensor Tendons
The extensor carpi radialis longus is a muscle found in the posterior compartment of the forearm. It is one of three primary wrist extensors and forms a flattened tendon that runs distally over the lateral surface of the radius.
Muscle Weakness: Is It a Common Issue for Everyone?
You may want to see also
Frequently asked questions
EC stands for Extensor Carpi Radialis, a muscle found in the posterior compartment of the forearm.
Extensor Carpi Radialis Longus (ECRL) and Extensor Carpi Radialis Brevis (ECRB).
They produce abduction and extension at the wrist.
It is one of the three primary wrist extensors and also helps to flex the elbow joint and is active during fist clenching.
