CHAPTER VII. 



Distribution of the Subepithelial Lymphatic Glands 



IN Man. 



It will be in order to commence an account of the 

 subepithelial lymphatic glands by describing their an- 

 atomy. They are nearly all distributed along the 

 course of the alimentary canal,* situated directly be- 

 neath the epithelium, but often in some " backwater " 

 or diverticulum and lying especially in those sections, 

 namely, throat, ileum, and caecum where bacteria 

 •' most do congregate." The following is a list of the 

 subepithelial lymphatic glands in the human body, 

 given in the order in which they are met with in passing 

 along the alimentary tract from mouth to anus. 



Faucial tonsils. Each faucial tonsil projects medially 

 into the isthmus faucium between the anterior pillar 

 (arcus glossopalatinus) in front and the posterior pillar 

 (arcus pharyngopalatinus) behind. The embedded por- 

 tion includes the great bulk of the gland and is en- 



* Lymph nodes occur along the larger air passages in the normal 

 mannnalian lung especially at the points of division of the bronchial 

 tubes. Hut for the most part they lie outside the muscidar layer and 

 often outside the cartilages (Miller, lf)ll). A nodule may, however, 

 at one point reach directly to the ciliated columnar epithelium as is 

 sliown in the figure of a beautiful preparation by Klein, 187.3. 

 fivrnph nodules also occur sparingly in the laryji^. (Hands, analogous 

 to lymphoid follicles, and called by Henle " trachoma " glands are 

 found in the conjunctiva, and, according to Strohmeyer, are chiefly 

 situated near the medial palpebral commissure. They were first des- 

 cribed by Brush in his description of Peyer's patches of the small 

 intestine as identical structures existing in the under eyelid of the 

 ox (Gray, 1916). These trachoma elands would be better known as 

 " conjunctival " subepithelial lymphatic nodules. 



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