Quain's elements of anatomy . rdingto Moleschott and others, there is likewise an intermixture of muscularfibre-cells. A number of granular rounded amoeboid cells are usually tobe found free in the air-cells and smaller bronchial tubes : not unfre-quently they contain carbonaceous particles. By the migration of thesecells into the pulmonary tissue, the carbon particles may be conveyedinto the substance of the lung and thence into the lymphatics and 518 THE LUNGS. bronchial glands, but fluids and fine particles can also, it is believed,penetrate directly to the lymphatics, both of the interalve
Quain's elements of anatomy . rdingto Moleschott and others, there is likewise an intermixture of muscularfibre-cells. A number of granular rounded amoeboid cells are usually tobe found free in the air-cells and smaller bronchial tubes : not unfre-quently they contain carbonaceous particles. By the migration of thesecells into the pulmonary tissue, the carbon particles may be conveyedinto the substance of the lung and thence into the lymphatics and 518 THE LUNGS. bronchial glands, but fluids and fine particles can also, it is believed,penetrate directly to the lymphatics, both of the interalveolar tissue andof the bronchial tubes, by aid of the pseudostomata which connect thecell-spaces of the connective tissue with the inner surface of the mucousmembrane (see p. 521). The aix-cells in the natiual state, are always filled with aii-. They are readilyseen on the surface and in a section of a lung, which has been inflated with airand dried; also upon portions of foetal or adult lung injected with mercury or Fig. Fig. 448.—Portion op the ottter surface op the cows lung (from KoUikerafter Harting). Magnified 30 diameters. a, pulmonary vesicles filled artificially with wax ; 6, the margins of the smallestlohules or infundibula. wax (fig. 448, a, a). In the lungs of some animals, as of the lion, cat. anddog, they are very large, and are distinctly visible on the surface of theorgan. In the adult human lung their most common diameter is about j^gthof an inch (025 mm.), but it varies from ^^th to ^th of an inch ; they arelarger on the sui-face than in the interior, and largest towards the thin edgesof the organ : they are also very large at the apex of the lung. Their dimensionsgo on increasing from birth to old age, and they are larger in men than in the infant the diameter is usually under ^oo^-^ ^^ ^^ inch. The whole lung has a lobulated structure best seen in the foetus, where thelungs, not yet distended with aii-, present very much the appearance of com
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