Overview: Aggregates of lymphoid nodules

Tonsils consists of aggregations of diffuse and nodular lymphoid tissues located in the lamina propria of the oral and pharyngeal mucosae. They are partially surrounded by a connective tissue capsule. The three types of tonsils (palatine, pharyngeal and lingual) form a ring, called “Waldeyer’s ring”, around the entrances of the nasal and oral cavities into the pharynx.

Tonsils consists of aggregations of diffuse and nodular lymphoid tissues located in the lamina propria of the oral and pharyngeal mucosae. They are partially surrounded by a connective tissue capsule. The three types of tonsils (palatine, pharyngeal and lingual) form a ring, called “Waldeyer’s ring”, around the entrances of the nasal and oral cavities into the pharynx.

Tonsils consists of aggregations of diffuse and nodular lymphoid tissues located in the lamina propria of the oral and pharyngeal mucosae. They are partially surrounded by a connective tissue capsule. The three types of tonsils (palatine, pharyngeal and lingual) form a ring, called “Waldeyer’s ring”, around the entrances of the nasal and oral cavities into the pharynx.

Tonsilar tissue is surfaced by the moist, stratified squamous epithelium of the oral and pharyngeal mucosae. Beneath the tonsil is connective tissue of the submucosa.

Tonsilar tissue is surfaced by the moist, stratified squamous epithelium of the oral and pharyngeal mucosae. Beneath the tonsil is a partial capsule consisting of submucosal connective tissue.

The lamina propria in the distal portions of the small intestine contains accumulations of MALT called Peyer’s patches, as seen in this section of the ileum.

The appendix, an appendage of the large intestine, is heavily infiltrated with MALT forming large numbers of lymphoid nodules.

The appendix, an appendage of the large intestine, is heavily infiltrated with MALT forming large numbers of lymphoid nodules.

The appendix, an appendage of the large intestine, is heavily infiltrated with MALT forming large numbers of lymphoid nodules.

This image was taken of a slide in the Oklahoma State University slide collection.