. The science and practice of medicine . st at right anglesto the bone. The Infra-Clavicular Regions are nearly square, corresponding toNo. 2 in the figures already referred to. Each region (right andleft) is bounded above by the inferior border of the clavicle ; belowby the lower border of the third rib, where it joins the cartilages ofthe sternum; it is bounded on the outside by the vertical line pass-ing from the acromial end of the clavicle downwards towards theexternal tubercle of the pubes (on either side); on the inner side thesubclavian region is bounded by the edge of the sternum. Wit
. The science and practice of medicine . st at right anglesto the bone. The Infra-Clavicular Regions are nearly square, corresponding toNo. 2 in the figures already referred to. Each region (right andleft) is bounded above by the inferior border of the clavicle ; belowby the lower border of the third rib, where it joins the cartilages ofthe sternum; it is bounded on the outside by the vertical line pass-ing from the acromial end of the clavicle downwards towards theexternal tubercle of the pubes (on either side); on the inner side thesubclavian region is bounded by the edge of the sternum. Within these limits is placed the upper lobe of the lung on both REGIONS OF THE THORAX. 531 sides, close to the sternal border of the region. On the right sidelie the superior vena cava, and a portion of the arch of the the left side, close to the sternum, is the edge of the pulmonary artery. The inferior border of the region on the left side corresponds toa portion of the base of the heart; while part of the right auricle Fig. occupies the inferior corner of the region towards the sternum onthe right side. The Mammary Region (ISTo. 3, Figs. 5, 6, and 7) has also a square-like form, and is bounded above by the line passing through thelower border of the third rib, where it joins the cartilages of thesternum below, by the line passing transversely on a level with thexiphoid cartilage (its upper border); outside by the vertical linepassing to the outer tubercle of the pubes (on either side); and onthe inner aspect by the edge of the sternum. The contents of the mammary regions differ greatly on the twosides. On the right side the lung lies throughout immediately under-neath the ribs. Its inferior border turns off almost at right angles 532 SPECIAL PATHOLOGY—THORACIC DISEASES. from the sternum, at the cartilage of the sixth rib, whence its thinsharp border gently slopes outwards and downwards, so as to occupythe lower part of the region when the diaphragm is depressed.
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