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The Appendicular Skeleton

Anatomy


labelled anatomy of forearm

AP Forearm


The radius and ulna make up the 2 long bones of the forearm. The upper end of the radius comprises a head, neck and tuberosity. The shaft is roughly triangular and has three borders - medial, anterior and posterior and the lower end has four surfaces. The upper end of the ulna comprises the olecranon and coronoid processes. The shaft has three borders - anterior, posterior and interosseous, and the lower end consists of a head and styloid process.

labelled anatomy of lateral forearm

Lateral Forearm


The head of radius articulates with the humerus superiorly and with the ulna medially to form the superior radioulnar joint. The medial surface of the lower end of the radius articulates with the ulna to form the inferior radioulnar joint. The distal end of the radius articulates with the scaphoid and lunate. The trochlea notch on the upper end of the ulna articulates with the humerus whilst the radial notch articulates with the head of radius.



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