Lab Exercise #6a
Part 1 - Epithelial Tissues
Let’s review….
Simple cuboidal epithelium

lining a tubule (longitudinal cut). Some of
the cell boundaries between "blocks" or
"cubes" here are quite distinct.
Simple Cuboidal

Covers surface of ovary, lines kidney
tubules and small ducts of glands (thyroid
and pancreas)
Tubule - cross section
simple cuboidal
Another example - kidney
Type?
Simple squamous epithelium

High power view of endothelial cells lining
a small blood vessel cut in cross-section.
(You see just the nuclei - the cytoplasm
between them is extremely flat.)
Endothelium = the simple squamous
epithelium lining blood vessels.
Simple squamous epithelium
Kidney
Superficial view
(squamous)
Type?
Simple columnar

Another example – intestine, with goblet
Intestinal lining
Yet another
Type?
Pseudostratified ciliated columnar
epithelium
Trachea. Nuclei are at different levels. All
cells touch the basement membrane, but
only the taller cells reach the lumen. The
cilia are longer and less regular than the
microvilli of a striated border.
Pseudostratified
Columnar Epithelium
Look like multiple layers
 Trachea

Figure 4–5b
Another example
Cilia – surface view
Type?
Bladder Low power
Transitional Epithelium
Tolerates stretching
 Appearance changes (stratified to simple)
 Urinary bladder

Figure 4–4c
Type?
Stratified Squamous Epithelium
Figure 4–3b
Example
Example
Type?
Type?
Stratified Cuboidal Epithelium

Sweat gland ducts
Figure 4–4b
Type?
Stratified Columnar Epithelium
Rare
 Salivary gland duct

Figure 4–5c
Note

It is the shape of the most superficial layer
that determines what type of stratified
epithelium it is.
Today’s procedure
Set up microscope
 Get a slide (or up to 3 or 4)
 Follow instructions in Lab Manual
 Hints

 Start
on low power and locate epithelium (this
is the bulk of the work)
 Go to 10x, then 40x
 Draw tissue
 Return slide to box you got it from.
Today’s lab


Examine and draw at least one of each type of
epithelial tissue
Activity 1:
 Simple
 Simple
squamous
cuboidal
 Simple columnar
 Psuedostratified ciliated columnar
 Transitional
 Stratified squamous
 Stratified columnar
 Stratified cuboidal (?)
To turn in:
8 drawings on page I provide
 Review sheet
