. Cunningham's Text-book of anatomy. Anatomy. 108 OSTEOLOGY. border, and in conjunction with the facet on the inferior edge of the manubrium forms a recess on either side, in line with the articulation between the manubrium and body, into which the cartilage of the second rib fits. The inferior border of the body is curved, and is united in the middle line with the xiphoid process, whilst on either side it is pitted to receive the cartilages of the sixth and seventh ribs, the latter being in part supported by the xiphoid process. The middle line of the body of the sternum anteriorly correspond
. Cunningham's Text-book of anatomy. Anatomy. 108 OSTEOLOGY. border, and in conjunction with the facet on the inferior edge of the manubrium forms a recess on either side, in line with the articulation between the manubrium and body, into which the cartilage of the second rib fits. The inferior border of the body is curved, and is united in the middle line with the xiphoid process, whilst on either side it is pitted to receive the cartilages of the sixth and seventh ribs, the latter being in part supported by the xiphoid process. The middle line of the body of the sternum anteriorly corresponds to the floor of the medial surface furrow, which runs down the front of the chest in the interval between the two great pectoral muscles. The posterior surface is slightly concave from above downwards, and displays faint indications of three transverse lines in correspondence with those placed anteriorly. It is in relation with the pleura and pericardium, and affords attachment at its inferior extremity to the transversus thoracis muscle. The xiphoid process displays many varieties of form and structure. It is a pointed process of cartilage, supported by a core of bone connected above with the inferior end of the body of the sternum, and having its lower extremity, to which the linea alba is attached, free. It lies somewhat posterior to the plaue of the anterior surface of the manubrium, and forms a floor to the V-shaped interval between the cartilages of the seventh ribs. In this way a depression is formed, the surface hollow in correspondence with which is called the pit of the stomach or infrasternal depression. To the sides of this process are attached the aponeuroses of the abdominal muscles, whilst posteriorly the fibres of the diaphragm and transversus thoracis muscles derive attachment from it. It remains partly cartilaginous until middle life, at which time it generally undergoes ossification, particularly at its upper part, becoming fused with the body. Of varied fo
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