. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. 492 MUQUEUSE. difficiles à rejeter la croyance qu'il est intimement concerné dans la fonction glandulaire, et varie en correspondance avec elle. À la précédente compte rendu sommaire de ces trois grands types d'épithélium beaucoup pourraient être ajoutées concernant l'formes intermédiaires. Tliis, toutefois, ne semble pas être nécessaire en général pour une description. L'alimentation et l'sont prismatiques vu superposée dans les speci- hommes QUE J'ai pensé à partir de la membrane tympanique humaine (fig. 281). De la non-ciliées et cilié epithel

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 492 MUCOUS MEMBRANE. difficult to reject the belief that it is intimately concerned in the glandular function, and varies in correspondence vith it. To the preceding summary account of these three principal kinds of epithelium much might be added respecting the intermediate forms. Tliis, however, does not appear to be required in so general a description. The spheroidal and the prismatic are seen blended in the speci- men I have figured from the human membrana tympani (fig. 281). Of the non-ciliated and ciliated epithelium.— The true scaly variety appears never to be clothed with cilia. The prismatic epithelium is that which most commonly bears these vibra- tile organs. They are placed on the free extre- mities of the prisms in the respiratory tract and in the uterus and Fallopian tubes. The true glandular epithelium is always without cilia. This is a general fact, and one of great import- ance. But those varieties which seem interme- diate between the spheroidal and the other two forms are often furnished with cilia; of which examples maybe seen in the Malpighian bodies of the kidney, in the mucous membrane of the frog's mouth, and in that of the human tympa- num (/g. 281). In all cases the cilia, when F':g. 284.. Various particles of epithelium from the frog's mouth. a, b, c, small particles that have not reached the surface. They appear to present three stages or periods, showing a subdivision of the nucleus and a formation of two cells out of one ; rf, three fully developed particles, with cilia on their free sur- face j e, f, g, other complete particles, showing cilia on that part only which has formed a portion of the general surface of the membrane. Magnified 400 diameters. they exist, are developed only on that aspect of the particles which forms a portion of the gene- ral surface of the membrane. It is as yet entirely unknown by what pro- cess the cilia are produced and nourished ;

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