Quain's elements of anatomy . ment epithelium-cells begin toappear amongst the ciliated cells, especially in the neighbourhood of theair-cells upon the wall of these tubes. At the end of the respiratorybronchiole, near the passage to the infundibula, all the cells which finethe wall of the tube are of the non-cihated pavement variety. But theair-cells themselves, both those which are scattered over the respiratorybronchioles and those Avhich cover the infundibula, as well as interme-diate portions of the infundibula which occur here and there between the STEUCTUEE OF THE PULMOjSTAEY PAEEXCHYMA
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Quain's elements of anatomy . ment epithelium-cells begin toappear amongst the ciliated cells, especially in the neighbourhood of theair-cells upon the wall of these tubes. At the end of the respiratorybronchiole, near the passage to the infundibula, all the cells which finethe wall of the tube are of the non-cihated pavement variety. But theair-cells themselves, both those which are scattered over the respiratorybronchioles and those Avhich cover the infundibula, as well as interme-diate portions of the infundibula which occur here and there between the STEUCTUEE OF THE PULMOjSTAEY PAEEXCHYMA, 517 air-cells, possess an epithelium of a peculiar character. The cells ofthis epithelium are of two kinds, viz. :—1, large, thin, very delicatecells, irregular in size and shape, lying over the blood-vessels, butalso in many cases extending over the interstices between them ;they appear not to possess a nucleus : and, 2, small, flat, polygonal, nucleated cellsj which lie singly or in small groups of two or three Fig. 447.. Fig. 447.—Section of part op cats lung, stained with nitrate of silver(Klein and Noble Smith). Highly Magnified. The small granular and the large flattened cells of the alveoli are shown. In the middleis a section of a lobular bronchial tube, with a patch of the granular pavement epithelium-cells on one side. cells, between the others, and always in the interstices of the capillarynetwork. In the foetus the alveoli are entirely lined with small granular pavement cells, but with the distension which follows upon the first respiratory efforts most ofthe cells become transformed into the large thin epithelial elements abovedescribed. The walls of the alveoli, which mainly consist of an indistinctlyfibrillated connective tissue with corpuscles scattered here and there, are supported and strengthened by scattered and coiled elastic fibres, especially numerous near their orifices, in addition to which, accordingto Moleschott and others, there is likewise an inte