Extensor carpi radialis muscle

Extensor carpi radialis longus muscle

The Extensor Carpi Radialis is one of the key muscles in the human forearm. It is responsible for the extension and abduction of the wrist. The muscle originates from the lateral epicondyle of the humerus and inserts into the base of the second and third metacarpal bones.

Structure

The Extensor Carpi Radialis is divided into two parts: the Extensor Carpi Radialis Longus and the Extensor Carpi Radialis Brevis. The Longus originates from the lateral supracondylar ridge of the humerus, while the Brevis originates from the lateral epicondyle of the humerus.

Function

The primary function of the Extensor Carpi Radialis is to extend and abduct the wrist. This muscle also assists in the flexion of the elbow.

Clinical Significance

Damage to the Extensor Carpi Radialis can result in a condition known as Radial Deviation, where the wrist bends towards the thumb. This condition can be diagnosed through a physical examination and confirmed with an MRI.

See Also

• Muscles of the upper limb
• Forearm
• Radial Deviation