Developmentally, why are secretory glands described as epithelial specialisations?
Multicellular glands. The simplest form of a multicellular gland is a secretory epithelial sheath-a surface epithelium consisting entirely of secretory cells (e.g. the epithelium lining the inner surface of the stomach, where the mucous secretion protects the stomach wall from the acidic contents of the stomach) .