Medial epicondyle of the humerus

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The medial epicondyle of the humerus is a bony prominence located on the inner side of the humerus, the long bone of the upper arm. It serves as an important anatomical landmark and a site of attachment for muscles and ligaments.

Anatomy

The medial epicondyle is situated at the distal end of the humerus, on its medial aspect. It is larger and more prominent than the lateral epicondyle of the humerus, which is located on the outer side of the humerus. The medial epicondyle can be palpated easily through the skin and is a key reference point in the examination of the elbow joint.

Function

The medial epicondyle serves as the origin for several muscles of the forearm, including the flexor carpi radialis, flexor carpi ulnaris, palmaris longus, and the pronator teres. These muscles are primarily responsible for the flexion and pronation of the forearm. Additionally, the ulnar collateral ligament of the elbow joint attaches to the medial epicondyle, providing stability to the elbow joint.

Clinical Significance

Injuries to the medial epicondyle are common, especially in athletes who engage in repetitive throwing motions, such as baseball pitchers. One common injury is medial epicondylitis, also known as "golfer's elbow," which is characterized by pain and inflammation of the tendons attached to the medial epicondyle. Fractures of the medial epicondyle can also occur, particularly in children, and may require surgical intervention.

Related Structures

• Humerus
• Elbow joint
• Flexor carpi radialis
• Flexor carpi ulnaris
• Palmaris longus
• Pronator teres
• Ulnar collateral ligament of the elbow joint
• Medial epicondylitis

See Also

• Lateral epicondyle of the humerus
• Epicondyle
• Elbow injuries and disorders