. Cunningham's Text-book of anatomy. Anatomy. 1082 THE EESPIKATOEY SYSTEM. The mucous membrane is laid smoothly over the interior of the tube upon a layer of submucous areolar tissue. Lymph tissue enters largely into the composition of the tracheal mucous membrane, and its inner surface is lined with columnar ciliated epithelial cells. The action of the cilia exercises an important influence in producing an upward movement of the mucus which is present on the surface of the mucous membrane. Numerous longitudinal bundles of elastic tissue are present in the dorsal wall of the trachea, more part
. Cunningham's Text-book of anatomy. Anatomy. 1082 THE EESPIKATOEY SYSTEM. The mucous membrane is laid smoothly over the interior of the tube upon a layer of submucous areolar tissue. Lymph tissue enters largely into the composition of the tracheal mucous membrane, and its inner surface is lined with columnar ciliated epithelial cells. The action of the cilia exercises an important influence in producing an upward movement of the mucus which is present on the surface of the mucous membrane. Numerous longitudinal bundles of elastic tissue are present in the dorsal wall of the trachea, more particularly in its inferior part, between the mucous membrane and the trachealis muscle. In connexion with the mucous membrane there is a plentiful supply of acinous mucous glands. These are placed in the submucous tissue, and also, on the dorsal aspect of the tube, on the exterior of the trachealis as well as amidst its muscular bundles. They send their ducts to the surface of the mucous membrane, where they open by trumpet- shaped mouths. BRONCHI. The two chief bronchi proceed obliquely downwards and laterally from the ter- mination of the trachea, each towards the hilus of the corresponding lung. Like the. Fig. 861.—Drawing op a Stereoscopic Skiagraph of the Trachea and Bronchi injected with Starch and Red Lead. trachea, they are kept permanently patent by the presence of cartilaginous rings in their walls. These rings are deficient dorsally, so that the bronchi exhibit a flattened dorsal surface, in every respect similar to the trachea. The two bronchi differ from each other, not only in the relations which they present to surrounding, structures, but also in length, in width, and in the direction which they pursue (Fig. 858, p. 1079). The first collateral branch of the right bronchus (ramus bronchialis eparterialis) arises much nearer the trachea than the first branch of the left bronchus. This difference determines the length of the primary divisions of the trachea, and, a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
