Manual of human histology . lies the ciliated epithelium, which is laminated and dififers inno respect from that of the larynx. Numerous glands exist inthe mucous membrane; these are: 1. smaller ones of ^—5,found especially on the anterior wall, within the mucousmembrane and immediately exterior to the elastic layer; and2. larger of \—V, which occur more in the posterior wall,externally to the muscles and the whole mucous membrane,or between the cartilages. These glands differ from those ofthe larynx only inasmuch as the larger of them alone havethe usual tesselated epithelium in their vesicle
Manual of human histology . lies the ciliated epithelium, which is laminated and dififers inno respect from that of the larynx. Numerous glands exist inthe mucous membrane; these are: 1. smaller ones of ^—5,found especially on the anterior wall, within the mucousmembrane and immediately exterior to the elastic layer; and2. larger of \—V, which occur more in the posterior wall,externally to the muscles and the whole mucous membrane,or between the cartilages. These glands differ from those ofthe larynx only inasmuch as the larger of them alone havethe usual tesselated epithelium in their vesicles; whilst thesmaller, situated in the mucous membrane itself, and someof which are in the strictest sense simple, or only bifurcatedcsecal follicles, present in their oval gland-vesicles, 0-02—003in size, a very narrow cavity and walls of 0-006—001, a thick-ness which may, perhaps, be referred altogether to the wellmarked cylinder-epithelium. The blood-vessels of the trachea are very numerous, and, in THE LUNGS. 167. the mucous membrane, are especially characterised by the cir-cumstance, that the larger branches run chiefly in a longi-tudinal direction, whilst ii XI ?^ -u Pis- 235, the superncial capillarj^ plexus,which is frequentlymet with above the elas-tic elements, close beneaththe homogeneous layer,more commonly formsrounded-angular trachea is abundantlyfurnished with lymphatics;and in one case I foundtheir commencement inthe mucous membrane, inthe form of wide-meshed plexuses OOOS—0001 broad, ofthin-walled vessels, from which, here and there, isolated, csecalprocesses were given off (fig. 235). The ner^ves also of the tra-chea are numerous, and present the same conditions as thoseof the larynx. % 175. Lungs.—The lungs are two large, compound, racemoseglands, in which are to be distinguished : 1. a special serouscoat—the pleura ; 2. the secreting parenchyma, consisting ofthe ramifications of the two bronchi, with their terminations,the air-cells,
Size: 1751px × 1426px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
