Lymphoid nodule
Lymphoid nodules, consisting primarily of lymphocytes, are more highly organized than are diffuse lymphoid tissues. Lymphoid nodules filter fluid in the layer or organ in which they are located such as tissue fluid in the lamina propria, lymph in lymph node and blood in spleen. Antigens present in the filtrate initiate an immune response in these nodules. 200x
Primary lymphoid nodule >
Lymphoid nodules are classified as primary or secondary. A primary lymphoid nodule, as shown here, consists of a solid, spherical mass of lymphocytes. This primary nodule, located in lamina propria, filters tissue fluid and, with antigenic stimulation, can become a secondary nodule with a pale staining central region called the germinal center.
Epithelium >
The mucosa in this image is composed of a stratified squamous moist epithelium and the underlying lamina propria in which the primary lymphoid nodule is located.
Lamina propria
The mucosa in this image is composed of a stratified squamous moist epithelium and the underlying lamina propria in which the primary lymphoid nodule is located.
PREVIOUS