Diffuse lymphoid tissue
The diffuse lymphoid tissue shown here is located in the lamina propria of the mucosa, where it filters tissue fluid percolating through the connective tissue. As such, it forms part of MALT (mucosa-associated lymphoid tissue). 200x, 400x
Diffuse lymphoid tissue >
Diffuse lymphoid tissue in the lamina propria is present either as isolated patches (shown here) or associated with aggregated lymphoid tissues, such as tonsils and Peyer’s patches. Diffuse lymphoid tissue is also found in the paracortex of the lymph node and the white pulp of the spleen.
Epithelium >
These mucosas are lined by simple columnar epithelium on the left and by stratified squamous moist epithelium on the right. These epithelia provide a barrier against microbial invasion. If microbes penetrate this epithelium and enter the lamina propria, they may be phagocytosed or may encounter diffuse lymphoid tissue, which produces an immune response.
Lamina propria
These mucosas are lined by simple columnar epithelium on the left and by stratified squamous moist epithelium on the right. These epithelia provide a barrier against microbial invasion. If microbes penetrate this epithelium and enter the lamina propria, they may be phagocytosed or may encounter diffuse lymphoid tissue, which produces an immune response.
Muscularis mucosae
These mucosas are lined by simple columnar epithelium on the left and by stratified squamous moist epithelium on the right. These epithelia provide a barrier against microbial invasion. If microbes penetrate this epithelium and enter the lamina propria, they may be phagocytosed or may encounter diffuse lymphoid tissue, which produces an immune response.
Lymphatic vessel
These mucosas are lined by simple columnar epithelium on the left and by stratified squamous moist epithelium on the right. These epithelia provide a barrier against microbial invasion. If microbes penetrate this epithelium and enter the lamina propria, they may be phagocytosed or may encounter diffuse lymphoid tissue, which produces an immune response.
Arteriole and venule
These mucosas are lined by simple columnar epithelium on the left and by stratified squamous moist epithelium on the right. These epithelia provide a barrier against microbial invasion. If microbes penetrate this epithelium and enter the lamina propria, they may be phagocytosed or may encounter diffuse lymphoid tissue, which produces an immune response.
Image source >
This image was taken of a slide from the University of Mississippi collection.
