Illustrations of secretory cells: Exocrine and Endocrine pancreatic cells, parathyroid and thyroid endocrine cells, adenohypophysis, adrenal & pineal endocrine cells, the numerous kinds of gastric exocrine and endocrine cells, the mucous secretory cells of lungs and of bowels, the salivary gland cells, the lacrimal gland cells, sebaceous gland cells, secretory cells of the testicles and ovaries and so on, are all illustrations of secretory cells.