Coronoid process of 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.
English: Coronoid process of ulna
Latin: Processus coronoideus ulnae
|Proximal aspect of ulna
|Articulation with the humerus, stabilises the elbow joint, prevents hyperflexion of the elbow
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