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Yousun Koh

Radius and ulna: Posterior view (Latin)

Radius and ulna: Posterior view (Latin)

Posteriorly, the margines interossea et posterior radii can be identified. The margo interossea radii forms the radial attachment point for the membrana interossea of the forearm, that spans the space between the radius and ulna. The tuberculum dorsale protrudes on the posterior aspect of the caput radii and is seated between the grooves for the tendons of the mm. extensor carpi radialis longus and brevis, as well as the tendon of the mm. extensor pollicis longus. The processus styloideus radii can also be identified from this posterior view. From a posterior aspect, the ulna is rounded and smooth and can be palpated subcutaneously along the entire length of the medial antebrachial region. The proximal end of the posterior ulna presents a hook-shaped process known as the olecranon. This bony protrusion serves as a short lever for extension of the elbow. The margines interossea et posterior ulnae can also be appreciated from this view.
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