Epithelial reticular cells (or epithelioreticular cells) are a structure in both the cortex and medulla of the thymus. In Anatomy and Zoology the cortex ( Latin: "bark" "rind" "shell" or "husk" is the outermost (or "superficial" In Human anatomy, the thymus is an organ located in the upper Anterior portion of the chest cavity just behind the Sternum. However, histologically, they are more easily identified in the cortex. These cells contain secretory granules which are thought to contain the thymic hormones.
There are six different types: Types 1-3 are in the cortex, and types 4-6 are in the medulla.