Quain's elements of anatomy . ner and Martinto communicate with those of neighbouring cells, so as to form a com-municating network throughout the extent of the membrane, underneaththe epithehum. Amongst these branching central ends of the columnarcells there are a large number of peculiar spindle-shaped cells (, J), each consisting of a large, clear nucleus surrounded by a rela-tively small amount of granular protoplasm. From each cell proceeds asuperficial and a deep process. The superficial process (c) is a cylindricalor shghtly tapering thread passing directly to the surface, and te
Quain's elements of anatomy . ner and Martinto communicate with those of neighbouring cells, so as to form a com-municating network throughout the extent of the membrane, underneaththe epithehum. Amongst these branching central ends of the columnarcells there are a large number of peculiar spindle-shaped cells (, J), each consisting of a large, clear nucleus surrounded by a rela-tively small amount of granular protoplasm. From each cell proceeds asuperficial and a deep process. The superficial process (c) is a cylindricalor shghtly tapering thread passing directly to the surface, and termi-nating abruptly at about the same level as the fiee surface of the epi-thelial cells between which it lies, or a little beyond ; the deep process (d)is more slender, and passes vertically inwards. This last frequentlypresents a beaded appearance similar to that observed in fine nerve-fila-ments. These cells were termed by Max Schultze, olfactory cells, todistinguish them fiom the columnar epithelium-cells, Avhich are much. 474 THE NOSE. fewer in number, and wlucli are entirely surrounded with the fine rod-hke peripheral processes of the smaller cells. It is probable that the finevaricose central processes of these cells are directly continuous with thefibrils of the olfactory nerve, but the continuity has never been actuallyobserved. The nucleated bodies of the olfactory cells are several rowsdeep, and form a layer of considerable thickness beneath the columnarcells. Both the olfactory and the columnar cells project through aperturesin a cutioular lamina which bounds the mucous membrane superficially{external limiting memlrane of v. Brunn). The peripheral process of the olfactory-cell was observed by Schultze to be sur-?mounted by a short projection (fig. 414-, 2, c), but this appearance may result fromthe coagulation of albuminous matter escaped from the interior of the and fine hair-like processes do, however, exist on the olfactory-cells ofamphibia, reptiles
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
