A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . f the rings. Bytheir contraction they increase the curvature of thecartilage and so diminish the caliber of the right bronchus contains six to eight of these carti-lages; the left ten to twelve. Further removed fromthe trachea the cartilages gradually lose their ring-like Vol. II.—33 shape, and are disposed in irregular polygonal smaller and less frequent, they finally dis-appear in tubes of less diameter than millimeter(,if, inch), t
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . f the rings. Bytheir contraction they increase the curvature of thecartilage and so diminish the caliber of the right bronchus contains six to eight of these carti-lages; the left ten to twelve. Further removed fromthe trachea the cartilages gradually lose their ring-like Vol. II.—33 shape, and are disposed in irregular polygonal smaller and less frequent, they finally dis-appear in tubes of less diameter than millimeter(,if, inch), the fibrous layer still continuing to formthe external coat. The Muscular Loj/er lies within the fibrous layer justdescribed. It consists of .separate bundles of un-striped muscular fibers, disposed for the most parttransversely to the tube; they are known to some asthe muscles of Roisseissen. it is better developed inthe intervals between the cartilages than just beneaththem. As the cartilages this muscularlayer becomes better and better developed, until atlast it completely surrounds the bronchioles, which, on. Fig. 1142.—Represents a Transverse Section of the BronchialWall at the Fifth Bifurcation in the Human Adult, a. Epitheliallayer of the mucous membrane; 6, hyaline basement membrane,formed from c, internal elastic layer, showing its varying thiciiness;d, d, muscular layer; e, muciparous crypts; /, cartilaginous lamina;g, external layer; h, branch of bronchial artery. (X about 30diameters.) (Drawn with camera by Dr. F. Cary.) section, but for the epithelial lining, might be mistakenfor arterioles. The muscular layer can be traced tothe final branching of the bronchiole to form thealveolar passages, w-here, according to Rindfleisch, itbecomes again better developed into a sort ofsphincter at the point of entrance to the The function of the muscular lajer is tonarrow the caliber of the tubes. This is manifestedto any appreciable extent onl
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
