Archive image from page 360 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE KADIO-ULNAK JOINTS. 327 Olecranon Transverse portion of ulnar collateral ligament Semilunar notch Annular ligament of the radius Coronoid process Fig. —Annular Ligament of the Eadius. displacement of the head of that bone in a distal direction. The distal margin of this ligament is not directly attached to the radius. The synovial stratum is continuous with that which lines the elbow-joint. It closes the joint cavity at the distal unattache
Archive image from page 360 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE KADIO-ULNAK JOINTS. 327 Olecranon Transverse portion of ulnar collateral ligament Semilunar notch Annular ligament of the radius Coronoid process Fig. —Annular Ligament of the Eadius. displacement of the head of that bone in a distal direction. The distal margin of this ligament is not directly attached to the radius. The synovial stratum is continuous with that which lines the elbow-joint. It closes the joint cavity at the distal unattached margin of the annular ligament, where it is somewhat loosely arranged in its reflexion from the ligament to the neck of the radius. The epiphyseal fine at the proximal end of the radius is intra-capsular. Articulatio Radioulnaris Distalis. — The distal radio-ulnar joint is situ- ated between the lateral aspect of the head of the ulna and the ulnar notch on the medial side of the distal end of the radius. In addition, it includes the distal surface of the head of the ulna, which articulates with the proximal surface of a tri- angular articular disc by means of which the joint is excluded from the radio-carpal articulation. Discus Articularis.—The tri- angular articular disc (Figs. 309 and 311), besides presenting articular surfaces to two separate joints, is an important ligament concerned in binding together the distal ends of the radius and ulna. It is attached by its apex to the depression at the lateral side of the root of the styloid process of the ulna, and by its base to the sharp line of demarcation between the ulnar notch and the carpal articular surface of the radius. Capsula Articularis.—The fibrous stratum is very imperfect, and consists of scattered fibres, termed the anterior and posterior radio-ulnar ligaments (Fig. 310). These ligaments pass transversely between adjoining non-articular surfaces on the radius and ulna, and are of sufficient length to per
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