Atlas and text-book of topographic and applied anatomy . the slight develop-ment of the outer compact layers and by the preponderance of thespongy substance. Pressure-atrophy is consequently easily producedby tumors growing from within the chest or by aortic abscesses may rupture through a sternal foramen (Fig. 41),the presence of which is dependent upon a developmental foramina, like the very rare congenital fissures of the sternum, arealso important from a medico-legal standpoint, since a comparativelyslight trauma may produce a severe injury, particul
Atlas and text-book of topographic and applied anatomy . the slight develop-ment of the outer compact layers and by the preponderance of thespongy substance. Pressure-atrophy is consequently easily producedby tumors growing from within the chest or by aortic abscesses may rupture through a sternal foramen (Fig. 41),the presence of which is dependent upon a developmental foramina, like the very rare congenital fissures of the sternum, arealso important from a medico-legal standpoint, since a comparativelyslight trauma may produce a severe injury, particularly of the heart andof the great vessels. The synchondrosis which usually lasts throughoutlife between the manubrium and gladiolus is so firm that in fractures of the sternum (rare) in this vicinity pieces of bone almost always remain attached to themanubrium or gladiolus. The important artery of this region, the internal mammary, ramifies only in the thoracicand abdominal walls, although it gives off small branches (such as the mediastinal and thymic. Fig. 41 — with a foramen in the lowerportion of the body of the * Circus performers apparently suffer no discomfort from having some one hammer upon an anvil placed uponthe chest. t The chicken breast stands in contrast to the rare funnel breast, in which the sinking in of the body of the sternumis combined with a projection of the xiphoid process and of the costal margin. 94 TOPOGRAPHIC AND APPLIED ANATOMY. Fig. 42.—The anterior thoracic wall seen from within. The pleura has been removed. Fig. 43.—The right intercostal region. In the upper of the three intercostal spaces represented the pleura is stillintact; in the second it has been removed; in the third, the internal intercostal muscle as well as the pleura has beentaken away. arteries) and the comes nervi phrenici artery, which runs upon the pericardium in company withthe phrenic nerves. The artery arises as the first branch of the subclavian, crosses the sternoclav-i
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