Principles and practice of operative dentistry . tics depending upon their location and their par-ticular function, as, for instance, in the skin (Fig. 90) they may form thecuticle, or horny layer, when they are squamous or scaly in shape (Fig. 91);if forming the lining of a tubule of a sweat-gland they are cuhoidal; whenentering into the formation of the hair-sheath they are columnar (Fig. 92),while in the shaft of the hair they become squamous, the cells being over-laid like the scales of a fish (Fig. 93). In the development of the nail-plate they are also columnar, but rapidlybecome squamou
Principles and practice of operative dentistry . tics depending upon their location and their par-ticular function, as, for instance, in the skin (Fig. 90) they may form thecuticle, or horny layer, when they are squamous or scaly in shape (Fig. 91);if forming the lining of a tubule of a sweat-gland they are cuhoidal; whenentering into the formation of the hair-sheath they are columnar (Fig. 92),while in the shaft of the hair they become squamous, the cells being over-laid like the scales of a fish (Fig. 93). In the development of the nail-plate they are also columnar, but rapidlybecome squamous and cornified. In the mucous membrane of the mouth the most superficial layer ofepithelial cells is of the squamous variety, while beneath this lies a layerof spinous or furrowed cells, the spines of which interlock with neighboringcells, and by this means are held together. Immediately beneath thisstratum is another, the Malpighian layer, made up of small, soft, roundishcells, sometimes oval in form, and arranged in a regular order, standing. Fig. 84.—Graafian follicles, or ova, in various stages of development. X 80.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
