EPITHELIAL TISSUES LAB ©David B. Fankhauser, Ph.D., Professor of Biology and Chemistry University of Cincinnati Clermont College, Batavia OH 45103
Simple columnar epithelium	This page has been accessed  times since 2 October 2001.  8 October 1991, rvsd 18 October 1994, 12 Sept '95, 3 Oct '96, 16 Dec '96, 17 Sept '97, 11 Sept 99, 28 Sept 01	Simple squamous epithelium (top view)

First review and follow carefully the rules and regulations for microscope use. Also, be familiar with guidelines in Notebook Illustrations for these drawings.

Examine each of the following slides, note the features in common and those which are differentiating. Illustrate each at 400x to take up most of a page. Include and label each listed feature, and give a brief description of its function or significance. Compare with the plates in Eroschenko's Atlas of Normal Human Histology, 9th Ed (VE).
 
 

Thumbnail Image	Tissue type, slide, description	Features to label in your illustration
	1. (slide 2) Simple squamous epithelium, (VE:11): top view of peritoneum, a serous membrane (an example of mesothelium, derived from mesoderm). It functions where a slick friction-free surface is required, or ready exchange across membranes is essential: lung alveoli, capillary endothelium, kidney glomerulus Here is a labeled view of simple squamous epithelium.	cell borders nucleus nucleolus tiled appearance (its heterogeneity is due to variations in sample preparation)
	2. (slide 3) Simple cuboid epithelium, (VE:257) section of kidney. In the cortex (outer portion) of the section, view the proximal convoluted tubules with brush borders. Here is a labeled view of simple cuboid epithelium.	proximal convoluted tubule basement membrane nuclei lumen brush border (only on proximal convoluted tubules)
	3. (slide 4) Simple columnar epithelium, (VE:13) c.s. of the intestine of a Nectarus (a newt). Note the classic four functional layers of a GI wall, inside to outside: mucosa, submucosa, muscularis, and serosa. Here is a 40x view of the villi. Here is a labeled view of simple columnar epithelium.	basement membrane brush border nuclei goblet cells lamina propria (connective tissue which underlies mucous membrane) capillaries in lamina propria (lacking in epithelium)
	4. (slide 5) Stratified squamous epithelium,(VE:17) dog esophagus. This tissue is especially resistant to friction. Note the mucous alveoli of the esophageal glands. Here is a labeled view of stratified squamous epithelium.	basement membrane basal cells (brownish cells along basement membrane where mitosis occurs) squamous cells being shed (superficially, include nucleated surface cells) lamina propria
	5. (slide 6) Pseudostratified ciliated columnar epithelium, c.s. of trachea , (try slide 11 if the detail is poor) (VE:15) This tissue is especially prominent in the respiratory tree. Here is a labeled view of pseudostratified columnar epithelium.	basement membrane numerous nuclei in deeper half of the tissue goblet cells cilia (contrast with brush border for appearance & function) lamina propria