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The distal end of the ulna is much smaller in diameter than the proximal end. The head articulates with the ulnar notch of the radius to form the distal radio-ulnar joint. Revisions: 33. We shall also consider its clinical correlations. By Anatomography [CC-BY-SA-2.1-jp], via Wikimedia Commons, By Jane Agnes [CC BY-SA 3.0], via Wikimedia Commons, [caption id="attachment_7966" align="alignright" width="202"], [caption id="attachment_7967" align="aligncenter" width="514"], [caption id="attachment_7968" align="alignright" width="112"], Clinical Relevance – Common Fractures of the Ulna. The ulna acts as the stabilising bone, with the radius pivoting to produce movement. The find out more about our cookies, click here. Our 3D anatomical model provides you with hands-on, interactive and valuable learning tool right here on your device. The triceps brachii can displace part of the fragment proximally. Fig 1.2 – Monteggia fracture of the radius and ulna. It is mostly unremarkable, terminating in a rounded head, with distal projection - the ulnar styloid process. Thus, fractures of both the forearm bones are not uncommon. Use the information in this article to help you with the answers. By visiting this site you agree to the foregoing terms and conditions. It can be palpated as... Coronoid process – … This information is intended for medical education, and does not create any doctor-patient relationship, and should not be used as a substitute for professional diagnosis and treatment. (The other, shorter bone of the forearm is the radius.) Important landmarks of the proximal ulna are the olecranon, coronoid process, trochlear notch, radial notch and the tuberosity of ulna: Olecranon – a large projection of bone that extends proximally, forming part of trochlear notch. Distally, the ulna articulates with the radius, forming the distal radio-ulnar joint. The medical information on this site is provided as an information resource only, and is not to beused or relied on for any diagnostic or treatment purposes. The proximal end of the ulna articulates with the trochlea of the humerus. It is broader close to the elbow, and narrows as it approaches the wrist. A fracture of the ulna alone (not involving the radius) usually occurs as a result of the ulna being hit by an object. As it moves distally, it decreases in width. To enable movement at the elbow joint, the ulna has a specialised structure, with bony prominences for muscle attachment. The shaft is the most likely site of fracture. Important landmarks of the proximal ulna are the olecranon, coronoid process, trochlear notch, radial notch and the tuberosity of ulna: Fig 1.1 – The bony landmarks of the proximal ulna. Make the changes yourself here! Proximally, the ulna articulates with the humerus at the elbow joint. The upper end of the ulna presents a large C-shaped notch—the semilunar, or trochlear, notch—which articulates with the … The ulna and the radius are attached by the interosseous membrane. Where is the Ulna Bone Located in the Human Body It is the medial bone of the forearm, located on the side opposite to the thumb, that is on the side of the little finger, extending from the region of the wrist to the elbow. To access the TeachMeAnatomy 3D Model, you must be a premium subscriber. The ulna is a long bone in the forearm. It lies medially and parallel to the radius, the second of the forearm bones. Fig 1.0 – Overview of the anatomical position of the ulna in the upper limb. In this situation, the normal muscle tone will pull the proximal ulna posteriorly. The ulna is located on the opposite side of the forearm from the thumb. The ulnar shaft is triangular in shape, with three borders and three surfaces. The distal end of the ulna is much smaller in diameter than the proximal end. If you do not agree to the foregoing terms and conditions, you should not enter this site. The ulna is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. This is caused by the patient falling on a flexed elbow. Found an error? Ulna, inner of two bones of the forearm when viewed with the palm facing forward. Try again to score 100%. The ulna is one of two bones that give structure to the forearm. In this article, we shall look at the bony landmarks and osteology of the ulna. The forearm is a common site for bone fractures. Cookies help us deliver the best experience to all our users. Once you've finished editing, click 'Submit for Review', and your changes will be reviewed by our team before publishing on the site. It is mostly unremarkable, terminating in a rounded head, with distal projection – the ulnar styloid process. Original Author(s): Oliver Jones Last updated: January 20, 2020 Less commonly, the olecranon process can be fractured. Here, we shall look at the common fracture types involving the ulna.

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