. Human physiology. is side. 1-t, 1-1. Leftpleura costalis on the parietes of the chest. Trachea. IG. Opening of the larynx and the epiglottic cartilage in situ. and top of the tongue. 19, 19. Right and left bronchia. heart enclosed in pericardium. 21. Upper portion of diaphragmon which it rests. 22. Section of oesophagus. Section of Arteria innominata. 25. Primitive carotid arteries. 26. Subcla- 1 , . n vian arteries. 27. Internal jugular veins. 28. Second cervical ver- jymphatlCS, nerves, and. tebra. 29. Fourth lumbar. areolar tissue. The ramific
. Human physiology. is side. 1-t, 1-1. Leftpleura costalis on the parietes of the chest. Trachea. IG. Opening of the larynx and the epiglottic cartilage in situ. and top of the tongue. 19, 19. Right and left bronchia. heart enclosed in pericardium. 21. Upper portion of diaphragmon which it rests. 22. Section of oesophagus. Section of Arteria innominata. 25. Primitive carotid arteries. 26. Subcla- 1 , . n vian arteries. 27. Internal jugular veins. 28. Second cervical ver- jymphatlCS, nerves, and. tebra. 29. Fourth lumbar. areolar tissue. The ramifications of the windpipe form the cavity of the organ of respira-tion. The trachea is continuous with the larynx, from which it re-ceives the external air conveyed to it by the mouth and nose. Itpasses down to the thorax, at the anterior part of the neck, and bifur-cates opposite the second dorsal vertebra, forming two large canalscalled bronchi or bronchia. One of these goes to each lung ; and, after 272 numerous subdivisions, becomes imperceptible ; lieuce, tlie multltiulin-ous speculations that have been indulged regarding the mode in whichthe bronchial ramifications terminate. Malpighi believed, that theyform vesicles, at the inner surface of which the pulmonary artery rami-fies. Reisseisen^ describes the vesicles as of a cjdindrical, and some-what rounded figure; and states, that they do not communicate witheach other. Ilelvetius,^ on the other hand, affirmed, that they end in cells, formed by the difterentFig- 79. constituent elements of the lung,—the cells having nodeterminate shape, or regularconnexion with each other;whilst M. Magendie asserts,that the minute bronchialdivision, which arrives at alobe, does not enter it, butterminates suddenly as soonas it has reached the paren-chyma; and, he remarks,that as the bronchus doesnot penetrate the spongytissue of the lung, it is notprobable, that the surfaceof the cells, with which theair comes in contact, is l
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Keywords: ., bookauthordungliso, bookcentury1800, bookdecade1850, bookyear1856
