74 ALIMENTARY CANAL. 



tissue. (H) Recognise the nerve cells at the nodes. They 

 do not show very distinctly as a rule. 



20 Peyer's patch. V.S. Cat. (p. 3, inj., s. 22 & 24, c. P., m. B.) In 

 the sub-mucosa find the clusters of lymph nodules ; these project 

 to the free surface of the mucosa, where they are covered by a 

 single layer of flattened cells which (H) exhibit local thinnings, 

 so that the line of separation between the cell-loaded adenoid 

 tissue and the cavity of the gut is reduced to a thin film with 

 possible apertures. Between the rounded heads of neighbouring 

 nodules the villi form narrow fringes. 



Injected Peyer's patch. (Blue gelatin mass. p. 2 (d), s. 24, 

 c. P., m. B. ; or c. G., s. 24 on the slide, m. B.) (L) The injected 

 capillaries form a network in the villi close under the epithelium, 

 and are connected with vessels in the sub-mucosa. Capillary 

 loops, few in number, project from the surface into the lymph 

 nodules, which, though rich in cells, are not very vascular. In 

 this respect they resemble lymphatic glands. (See later.) 



Large Intestine. V.S. Cat or Dog. (p. 3, inj., s. 22 & 24, 

 c. P., m. B.) (L) There are no villi, and the only glands are of 

 the Lieberkiihn. variety. Lymph nodules occur occasionally. 

 The muscular wall is thinner than that of the small intestine. 

 (H) Goblet cells are numerous in the glands amongst the 

 other cells. 



Injected large intestine. (Blue gelatin mass. p. 2 (d), s. 24, c. P., 

 m. B.) The blood vessels form a rich capillary network around 

 the glands. 



Vermiform Appendix. Man. T.S. (p. 3, s. 22 & 24, c. P., 

 m. B.) (L) The mucosa is scantily supplied with Lieberkiihn's 

 glands ; there is much interstitial tissue in which lymph nodules 

 are somewhat diffusely projected from the sub-mucosa. (H) The 



