Simple Columnar Epithelium with Goblet Cells, Villus, Small Intestine--50X. The simple columnar epithelium shows abundant goblet cells, the striated border (microvilli), and basement membrane. Goblet cells (clear) secrete mucus. Also shows supporting connective tissue (lamina propria) and part of the circular layer of smooth muscle (bottom). The mucosa consists of the simple columnar epithelium and lamina propria. H & E stain.