Let’s review….
Lab Exercise #7
Epithelial Tissues
Simple cuboidal epithelium
„
lining a tubule (longitudinal cut). Some of
the cell boundaries between "blocks" or
"cubes" here are quite distinct.
Tubule - cross section
simple cuboidal
Simple Cuboidal
„
Covers surface of ovary, lines kidney
tubules and small ducts of glands (thyroid
and pancreas)
Another example - kidney
1
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?
2
Simple columnar
„
Intestinal lining
Another example – intestine, with goblet
Yet another
Type?
Pseudostratified ciliated columnar
epithelium
Pseudostratified
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.
Look like multiple layers
„ Trachea
„
Figure 4–5b
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Another example
Cilia – surface view
Type?
Bladder Low power
Transitional Epithelium
Type?
Tolerates stretching
„ Appearance changes (stratified to simple)
„ Urinary bladder
„
Figure 4–4c
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Stratified Squamous Epithelium
Example
Figure 4–3b
Example
Type?
Type?
Stratified Cuboidal Epithelium
„
Sweat gland ducts
Figure 4–4b
5
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
„ 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
Today’s lab
Examine and draw at least one of each
type of epithelial tissue
„ Activity 1:
„
„
Simple
squamous – two options: kidney
glomeruli, mesothelium
Simple cuboidal – kidney tubules
Simple columnar – large intestine (frog,
human)
Examine and draw
„ Activity 2:
Psuedostratified
Transitional
ciliated columnar – trachea
– ureter
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Today’s lab
„
„
Examine and draw
Activity 3:
Stratified
squamous (skin, oral smear, frog
superficial view)
Stratified columnar (salivary gland)
No stratified cuboidal (don’t need to do)
Lab Write up
Turn in:
„ 7 drawings on page I provide
„ Parts A, B, C, only
„ Due next week on TUes
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