Image d'archive à partir de la page 359 de Cunningham's Text-book d'anatomie (1914). Cunningham's Text-book d'anatomie cunninghamstextb00cunn Année : 1914 ( 326 LES ARTICULATIONS OU LES ARTICULATIONS. position fléchie la main est mis en dedans dans le sens de la bouche. Flexion extrême£S bdu par des parties molles en avant du bras et de l'avant-bras qui entrent en contact, et de l'extrême "extension bv l'effet restrictif des ligaments et muscles. Dans chaque cas, le mouvement est vérifiée avant que soit le processus de coronoid de olecraconJnt lrauCs ou l°1 ; la partie antérieure et pos e résultats t- bandes du collatéral ulnaire liga-

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Archive image from page 359 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 326 THE ARTICULATIONS OR JOINTS. flexed position the hand is carried medially in the direction of the mouth. Extreme flexion bdu£S by the soft parts in front of the arm and of the forearm coming into contact, and extreme 'extension bv the restraining effect of the ligaments and muscles. In each case the movement is checked before either the coronoid process or the olecraconJnt°lrauCs1; The anterior and pos- terior bands of the ulnar collateral liga- ment are important factors in these re- sults. Lateral move- ment of the ulna is not a characteristic movement, although it may occur to a slight extent, owing to a want of complete adaptation between the trochlear surface of the humerus and the semilunar notch of the ulna. This incongruence is note- worthy since the medial lip of the trochlea is prominent in front, and the lateral lip is promi- nent behind. Conse- quently, this latter part is associated with a surface on the lateral side of the olecranon which is only utilised in com- plete extension. The capitulum and the opposing surface upon the head of the radius are always in varying degrees of contact. The head of the radius participates in the movements of flexion and extension, and is most closely and completely in contact with the humerus during the position of semi-flexion and semi-pronation. In complete extension a very considerable part of the capitulum is uncovered by the radius. Olecranon pad of fat Coronoid process Fig â Olecranon 307. Vertical Section through the Humero-ulnar Part of the Elbow-Joint. THE KADIO-ULNAR JOINTS. These articulations, which are two in number, are situated at the proximal and distal ends of the radius and ulna. They provide an adaptation whereby the radius rotates around a longitudinal axis in the movements of pronation and supination, and hence this form of uniaxial diarthrosi

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