The medial epicondyle of the humerus is a bony prominence that is located on the inner side or medial aspect of the lower end of the humerus bone in the upper arm. It serves as an attachment site for several important muscles and ligaments.
Anatomically, the humerus bone has two epicondyles, the medial epicondyle and the lateral epicondyle, which are positioned at the bottom of the bone. The medial epicondyle is larger and more prominent than the lateral epicondyle. It is located slightly more anteriorly and medially, closer to the midline of the body.
The primary function of the medial epicondyle of the humerus is to provide attachment points for various muscles and ligaments, especially those involved in flexion, pronation, and wrist movements. Several muscles originating or inserting on the medial epicondyle include the flexor carpi ulnaris, the pronator teres, the palmaris longus, and the flexor digitorum superficialis.
In addition to muscle attachments, the medial epicondyle also acts as a site for ligamentous attachments. The ulnar collateral ligament, a crucial stabilizing ligament for the elbow joint, has its origin from the medial epicondyle. This ligament plays a pivotal role in preventing excessive side-to-side movement of the elbow joint.
Overall, the medial epicondyle of the humerus is a significant anatomical landmark and plays a crucial role in the movement and stability of the upper limb.
