Manual of human histology . er individuals and in is therefore advisable, in the first instance, to seek for theseconditions in the lungs of a child. In this case the separatelobules are still all distinctly parted from each other by con-nective tissue and admit of being isolated, so that the tolerablyregular pyramidal form of the superficial, and the more irregularone of the interior lobules can be satisfactorily the adult, also, these smallest lobules, in size \—i—V, stillexist, but are so intimately united, that, even on the surface ofthe lung, their outlines are onl
Manual of human histology . er individuals and in is therefore advisable, in the first instance, to seek for theseconditions in the lungs of a child. In this case the separatelobules are still all distinctly parted from each other by con-nective tissue and admit of being isolated, so that the tolerablyregular pyramidal form of the superficial, and the more irregularone of the interior lobules can be satisfactorily the adult, also, these smallest lobules, in size \—i—V, stillexist, but are so intimately united, that, even on the surface ofthe lung, their outlines are only perceived with difficulty andimperfectly; and, in the interior of the organ, a more homo-geneous structure, something like that of the liver, is appa-rently presented. Secondary lobules, on the other hand, of\—\—1 in size (lobules of authors) are, even in the adult, THE LUNGS. 171 most usually evident and the more so, because their boundariesare indicated by streaks of pigmentary matter, which, in course Fig. of time, is deposited in the continuous interlobular, connectivetissue. These lobules are ultimately united together by a moreabundant interstitial tissue, so as to form the large well-knownlobes. Thus the lung consists entirely of larger and smaller groupsof air-cells and smallest bronchial tubes, and accordinglythe larger air-vessels also fall into certain definite groups,each of which stands in relation with only one of theformer. § 177. The intimate structure of the hronchics and air-cells is asfollows. The broncMcB are in general constituted in the sameway as the air-tubes and their branches, although from thevery commencement some differences are presented, which be-come greater and greater in their further course. It is mostproper to distinguish in them two membranes, ?k fibrous, stillin part containing cartilages, and a mucous, with a smoothmuscular layer. The former, constituted of connective tissueand elastic fibrils, is at first thick, as in the
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
