Extensor carpi radialis brevis

A muscle located in the forearm, responsible for extending and abducting the wrist.

The extensor carpi radialis brevis is a skeletal muscle located on the posterior side of the forearm. It originates from the lateral epicondyle of the humerus and inserts into the dorsal aspect of the base of the third metacarpal bone. This muscle plays a crucial role in wrist movements and is closely associated with the extensor carpi radialis longus, its neighboring muscle.

Terminologia Anatomica

extensor-carpi-radialis-brevis

System

Musculoskeletal system

Function

The primary function of the extensor carpi radialis brevis is to aid in the extension of the wrist joint, which allows the hand to move away from the forearm. This muscle also assists in abducting the wrist, which means it helps move the hand toward the thumb side of the body. These movements are essential for various daily activities, such as reaching for objects, typing, or playing sports. The extensor carpi radialis brevis works in coordination with other muscles of the forearm to provide stability and strength to the wrist during various movements, ensuring precise control and power when using the hand.

Location

Found in the forearm, the extensor carpi radialis brevis lies more towards the lateral side compared to its longer counterpart, the extensor carpi radialis longus. It begins at the lateral epicondyle of the humerus, a bony prominence near the elbow, and travels down the forearm before inserting on the base of the third metacarpal bone, which is located in the hand. The muscle is situated in the superficial layer of the posterior compartment of the forearm, making it relatively easy to palpate for both anatomical study and clinical assessment as it lies just beneath the skin.

Did You Know?

The extensor carpi radialis brevis is often involved in conditions such as tennis elbow due to repetitive use.
This muscle is active during most wrist-extending movements, showcasing its importance in daily functional tasks.
It is one of the primary wrist extensors, allowing for fine motor control and strength in the hand.