. Cunningham's Text-book de l'anatomie. L'anatomie. 198 l'ostéologie. de fibro-cartilage qui est interposée entre elle et la facette claviculaire sur la partie supérieure et latérale d'angle le manubrium sterni. Il s'appuie également sur une petite partie de l'extrémité médiale du cartilage de la première côte. Sa surface articulaire, plus généralement du haut en bas que de gauche à droite, affiche une convexité antéro-postérieur, tout en ayant tendance à être légèrement concave dans le sens vertical. La bordure autour de la zone articulaire, qui sert pour la fixation de la capsule de la surface articulaire du sternum Acromial articu

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. Cunningham's Text-book of anatomy. Anatomy. 198 OSTEOLOGY. of fibro-cartilage which is interposed between it and the clavicular facet on the upper and lateral angle of the manubrium sterni. It is also supported by a small part of the medial end of the cartilage of the first rib. Its articular surface, usually broader from above downwards than from side to side, displays an antero-posterior convexity, whilst tending to be slightly concave in a vertical direction. The edge around the articular area, which serves for the attachment of the capsule of the Sternal articular SURFACE Acromial articular surface. Tuberositas coracoidea Fig. 184.—The Right Clavicle seen from above. sterno-clavicular articulation, is sharp and well denned, except below where it is rounded. The shaft exhibits a double curve, being bent forwards in the medial two- thirds of its extent, whilst in its lateral third it displays a backward curve. Of rounded or prismatic form towards its sternal end, it becomes compressed and flattened at its acromial extremity. It may be described as possessing two surfaces, a superior and an inferior, separated by anterior and posterior borders, which are well defined towards the lateral extremity of the bone, but become wider and less well marked medially where they conform more to the cylindrical shape of the bone. The superior surface, which is smooth and subcutaneous throughout its whole length, is directed upwards and for- wards. The anterior border, which separates the superior from the inferior surface in front, is rough and tubercular towards its medial end for the attachment of the clavicular fibres of the pectoralis major, whilst laterally, where it becomes continuous with the anterior margin of the acromial end, it is better defined, and bears the imprint of the origin of the fibres of the deltoid muscle; here, not uncommonly, a projecting spur of bone, called the deltoid tubercle, may be seen. The 'posterior border is broad medially, . Please note tha

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