The pathological histology of bronchial affections, pneumonia and fibroid pneumonia : an original investigation / by A.G. Auld.

Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: The pathological histology of bronchial affections, pneumonia and fibroid pneumonia : an original investigation / by A.G. Auld. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    diameters, a phenomenon which is not apparent in the cells of Debove's layer. The basal layer of cells, already referred to, has quite the appearance of an endothelium in longitudinal sections, and was hence described by Debove * as a subepithelial endothel- ium. It is a single layer in the normal condition, though similar cells are invariably found here and there super- imposed, and even existing for some distance up amongst the columnar cells. It has been considered by some—e.g., Recklinghausen, Pagenstecher, Biesiadecki—-that some of these cells are migratory lymph corpuscles, but this seems, in the normal condition at least, to be very doubtful. Now whilst there can be little question as to the char- acters and nature of the cells already referred to, it yet remains to be seen whether the same can be said respecting certain of ■ the spindle-shaped or pyriform cells which are invariably found amongst the columnar cells. It is asserted by Klein, f in a somewhat emphatic manner, that there exist amongst the columnar cells true fixed connective tissue cells, and that these cells lie in spaces that form canals extending from the free surface of the epithelium downwards to the corium, where they communicate with the interfascicular lymph spaces, in which lie the connective tissue cells of the mucosa. And this eminent observer affirms that such cells (to which he has given the name of pseudo-stomatous cells) exist normally in all epithelia, and have a similar connec- tion with the endothelial cells of serous membranes. Klein characterises these cells as being more or less branched, being drawn out into at least two processes, one directed towards the mucosa and the other towards the free surface, the appearance being quite different from that of mere inter- * Comptes Bendus, D6cembre, 1872. ■\' Anatomy of the Lymphatic System, vol. ii., p. 26 ; see also his Alias of Histology.