.§ Longitudinal section of the tonsillar crypt U. In the center of the figure, the structure of the multilayered nonkeratinizing squamous epithelium [2 of the oral mucous membranes is completely obliterated by lymphocytes [3. It now has the structure of a sponge. The underlying lymphoreticular tissue HI follows without clear demarcation. The multilayered squamous epithelium to the right and left is for the most part intact. Only a few small, heavier stained lymphocytes reside in this part of the layer. The epithelium of the adjacent crypt wall (top of the figure) appears unchanged. Inflammation (tonsillitis) may cause increased scaling of epithelial cells. This, and the increased presence of leukocytes and microorganisms of the oral cavity, can lead to tonsillar plugs (detritus plugs, tonsillar abscess). Occasionally, these will calcify and form tonsillar stones (cf. Fig.336).
1 Tonsillar crypt
2 Multilayered nonkeratinizing squamous epithelium
3 Lymphocyte immigration and leukocytic diapedesis 243 4 Lymphoreticular tissue
Stain: azan; magnification: x 200 Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy © 2003 Thieme All rights reserved. Usage subject to terms and conditions of license.
The root of the tongue between sulcus terminalis and epiglottis features tonsillar crypts 0. These are short narrow caverns (invaginations). The tonsillar crypts may continue in the secretory ducts of mucous glands 0 or have a blind end. The crypts are lined by multilayered nonkeratinizing squamous epithelium and surrounded by lymphatic tissue.
The figure shows the multilayered squamous epithelium 0, which covers the root of the tongue and its crypts (invaginations, caverns) 0. The lymphore-ticular tissue (stained deep blue) HI underneath the epithelium is part of the lamina propria. Numerous more lightly stained areas are found in the lym-phoreticular tissue. These are secondary follicles. The lymphoreticular tissue is separated from the surrounding tissue by a more or less complete connective tissue capsule 0.
1 Tonsillar crypts
2 Mucous glands of the root of the tongue, glandulae linguales posteriores
3 Epithelium of the lingual mucous membrane
4 Lymphoreticular tissue with germinal centers
5 Connective tissue capsule g Stain: alum hematoxylin-eosin; magnification: x 14
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