The science and practice of medicine . liind;(4.) Around the lower part of the chest, on a level with the xiphoidcartilage. (See figures as before.) By these lines the lower part of the neck and the chest is divided 542 SPECIAL PATHOLOGY—THORACIC DISEASES. into three liorizontal and eiglit vertical bauds; and by the inter-sections of these lines various compartments or regions may be in-dicated. The most useful arrangement of the compartments and nomen-clature of the regions is as follows: Anterior, lateral, and posterior regions being recognized, the interiorare named the supra-clavicular, cl
The science and practice of medicine . liind;(4.) Around the lower part of the chest, on a level with the xiphoidcartilage. (See figures as before.) By these lines the lower part of the neck and the chest is divided 542 SPECIAL PATHOLOGY—THORACIC DISEASES. into three liorizontal and eiglit vertical bauds; and by the inter-sections of these lines various compartments or regions may be in-dicated. The most useful arrangement of the compartments and nomen-clature of the regions is as follows: Anterior, lateral, and posterior regions being recognized, the interiorare named the supra-clavicular, clavicular, infra-clavicular, mammar>/,infra-mammary, supra-sternal, superior sternal, and inferior sternal. The lateral regions are,—the axillari/ and the infra-axillary. The posterior regions are,—the supra-sjnnous region ; the infra-spin-ous region (sometimes called the scapular); the inter-scapular; theinfra-seaj)ular (sometimes called the upper dorsal). Of these regionsthe three sternal are single, all the rest are The Supra-Clavicular Region is a small triangular space above theclavicle on either side, with its base internally at the trachea, itsapex towards the outer end of the clavicle, and bounded below bythe upper edge of that bone. A line drawn from the outer part of BOUNDARIES AND CONTENTS OF THE THORACIC REGIONS. 543 the clavicle to the upper rings of the trachea will limit its upperborder. In this region is found the triangular apex of the lung (Figs. 8,9), sometimes reaching on the right side a little higher than on theleft, with portions of the subclavian and carotid arteries, and of thesubclavian and jugular veins. The floor of this region internallyis formed by the upper surface of the first rib. The Clavicular Region is very narrow and oblong, corresponding tothe inner two-thirds of the collar-bone. Behind the bone lies onboth sides lung-substance; but on the right side, at the sterno-clav-icular articulation, is the innominate artery, and the
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