Elements of histology / by E. Klein.

  • Edward Emanuel Klein
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: Elements of histology / by E. Klein. Source: Wellcome Collection.

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    imis. The cell protoplasm is more transparent in the i former, and the granular cells of the stratum granu- llosum are not always present, but they generally are I in the epithelium of the tongue and of the rest of the oral cavity. The most superficial scales show more or less horny transformation. { 23. Stratified columiiar epitiielium is met I I with on the lining membrane of the respiratory 1 i organs, as larynx, trachea, and large bronchi. It | j consists of several layers of columnar cells : a super- I ficial layer of conical or prismatic cells, with a more I or less pointed extremity directed towards the depth ; I between these are inserted spindle-shaped cells, and finally inverted conical cells. The epithelium of the ureter and bladder is called troMsitional ej)ithelium. It is stratified, and the most j superficial layer consists of squamous cells. Under- I neath this is a layer of club-shaped cells, between i which extend one or more layers of small spindle- i shaped cells. Amongst the columnar epithelial cells occurring I in man and mammals the ciliated cells and the goblet j cells, and amongst the squamous cells the prickle cells^ : deserve special attention. 24. CiSiated cells are characterised by possess- ing a bundle of very fine longer or shorter hairs or cilia on their free surface. These cilia are direct pro- longations of the cell protoplasm. More correctly 11 speaking, the cilia are continuous with the filaments j! or striae of the cell protoplasm. The superficial layer of conical cells of the epithelium in the respiratory ! organs, the columnar cells lining the uterus and ovi- 1 duct, and the columnar cells lining the tubes of the epididymis possess such cilia. In lower vertebrates the ciliated cells are much more frequently observed; in Batrachia the epithelial cells lining the mouth, pharynx, and oesophagus are ciliated.
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