Simple Squamous Epithelium
• Single layer of flat cells
– lines blood vessels (endothelium), closed body cavities
– very thin --- controls diffusion, osmosis and filtration
What is the primary function of this tissue (protection or transport)?
(Hint: What is its function as an endothelium,…as mesothelium?)
Examples of Simple Squamous
• Surface view of lining • Section of intestine
of peritoneal cavity showing serosa
Is this endothelium, mesothelium, or neither?
Simple Cuboidal Epithelium
• Single layer of cube-shaped cells viewed from the side
Where would you find simple cuboidal epithelium in the body? Does
it typically function in protection or transport in these locations?
Classification of Epithelial Tissues
Example of Simple Cuboidal
• Sectional view of kidney tubules
Why do some cells look as if they do not have a nucleus?
Nonciliated Simple Columnar
• Unicellular glands =goblet cells secrete mucus
– lubricate GI, respiratory, reproductive and urinary systems
• Microvilli = fingerlike projections of cell membrane
Describe the differences between cilia and microvilli in terms of
both their structure and function. Are you likely to find them
on the same tissue? Why or Why not?
Example: Nonciliated Simple Columnar
• Section from small intestine
The term “brush border” is often used to describe
this tissue. What does it refer to?
Ciliated Simple Columnar Epithelium
• Single layer rectangular cells with cilia
• Mucus from goblet cells moved along by cilia
Example Ciliated Simple Columnar
• Section of uterine tube
What is another name for this organ?
Stratified Squamous Epithelium
• Several cell layers thick
• Surface cells flat
• Keratinized = surface cells
dead and filled with keratin
• Nonkeratinized = no keratin in
moist, living cells at apical
– Example …?
What is the primary function of this epithelium?
If this epithelium is a portion of a mucus membrane, where does the mucus come from?
Example of Stratified Squamous
• Section of vagina
Stratified Cuboidal Epithelium
• Surface cells cuboidal
– rare (only found in
sweat gland ducts &
Stratified Columnar Epithelium
• Surface cells columnar
• Rare (very large ducts & part of male urethra)
• Surface cells varying in shape
from round to flat if stretched
• Lines hollow organs of the urinary List the expandable organs of the
tract that expand from within urinary tract.
• Single cell layer
• All cells attach to
but not all reach free
• Nuclei at varying
Name one location where you would find this
How would you describe its function?