The paper provides an overview of the current understanding of different cells and structures' biology [e.g., blood-retinal barrier, Bruch membrane, Clara (club) cells, brush cells and tuft cells, Merkel cells, Hofbauer cells, cytokeratins], including their origin, structure, function, and role in disease pathogenesis, and of the latest findings in the medical literature concerning the paracortex of the lymph nodes.
Keywords: Bruch membrane; Hofbauer cells; Merkel cells; brush cells; club cells.