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Coronoid process of ulna

Recommended video: Radius and ulna [14:04]
Overview of the bones that define the forearm, the radius and ulna.

The ulna is one of two bones of the forearm, together with the radius. Its proximal end is larger and specialized for articulation with the humerus proximally and radius laterally in order to form the elbow joint

The coronoid process is the smaller of two projections located on the proximal end of the ulna. The larger projection is called the olecranon. 

The coronoid process is pyramid-shaped and it projects anteriorly. It has a base, apex and four surfaces. The base is continuous with the body of the ulna, while the apex is directed in a superior direction. During flexion of the elbow the apex is accommodated in the coronoid fossa of the humerus. The lateral surface of the coronoid process forms the radial notch (for the head of the radius), while the superior surface forms the trochlear notch (for the trochlea of the humerus). 

The main function of the projections of the proximal ulna is to stabilize the elbow joint and prevent the hyperflexion of the elbow. In addition, it serves as the attachment for ligaments and muscles that act on the elbow joint.

Terminology English: Coronoid process of ulna
: Processus coronoideus ulnae
Location Proximal aspect of ulna
Function Articulation with the humerus, stabilises the elbow joint, prevents hyperflexion of the elbow

Learn everything about the anatomy and structure of the elbow joint with the following study unit:

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