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Styloid process of ulna

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

The styloid process of the ulna is a conical bony projection found on the distal end of the ulna. It projects distally from the posteromedial aspect of the head of the ulna. Relative to the styloid process of the radius, the ulnar styloid process is smaller and does not project as far distally, thus more ulnar deviation of the wrist is possible. When the forearm is in the supinated position, the ulnar styloid process may be palpated just distal to the head of the ulna.

The ulnar styloid process serves as an attachment point for the ulnar collateral and radioulnar ligaments as well as the apex of the fibrocartilaginous articular disc of the radioulnar joint. A shallow groove exists between the styloid process and head of the ulna, in which the tendon of the extensor carpi ulnaris sits. 

Terminology English: Styloid process of ulna
Latin: Processus styloideus ulnae
Definition Bony projection from on distal end of the ulna
Function Attachment point for the ulnar collateral and radioulnar ligaments

Learn more about the features of the ulna with this study unit (and article):

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