Extensor carpi radialis brevis muscle

Extensor carpi radialis brevis muscle is one of the muscles in the human body that is located in the forearm. It is shorter and thicker than its counterpart, the extensor carpi radialis longus muscle. The primary function of the extensor carpi radialis brevis muscle is to facilitate the extension and abduction of the wrist.

Anatomy

The extensor carpi radialis brevis muscle originates from the lateral epicondyle of the humerus, which is the bone in the upper arm. It inserts into the base of the third metacarpal bone in the hand. The muscle is innervated by the radial nerve, which provides it with the ability to contract and perform its functions.

Function

The main function of the extensor carpi radialis brevis muscle is to extend and abduct the wrist. Extension refers to the straightening of the wrist, while abduction refers to the movement of the wrist away from the midline of the body. This muscle plays a crucial role in many daily activities that involve the use of the hand and wrist, such as typing, writing, and lifting objects.

Clinical significance

Injury or strain to the extensor carpi radialis brevis muscle can lead to conditions such as tennis elbow, which is characterized by pain and tenderness on the outside of the elbow. This condition is commonly seen in individuals who engage in repetitive wrist and arm movements.

See also

• Muscular system
• Forearm
• Wrist
• Tennis elbow