September 2-3, 2015
What are these?
Tissues!
 Epithelial Tissue –
lining, covering, & glandular
 Connective –
protecting, supporting, and binding together
 Muscular – movement
 Nervous - control
Epithelial tissues lines all body surfaces and
cavities
Functions:
 protection
 absorption
 filtration
 secretion
Special features of epithelial tissue:
 Cells are tightly bound together
 Basal surface attached to basement
membrane, apical surface is free.
 Avascular – no blood supply. Nutrition and
gases diffuse from underlying connective tissue
 Excellent regenerative ability. Contain multi-
and uni-potent stem cells.
Turn & Talk:
How does each special feature relate to the
functions of epithelial tissue?
- 2 min
Basic Shapes
 Simple squamous
epithelium
A single layer of thin cells,
specializing in rapid
diffusion and filtration
Found in: alveoli of lungs,
walls of capillaries, kidney
glomeruli, and
serosae
 Simple squamous
epithelium
A single layer of thin cells,
specializing in rapid
diffusion and filtration
Found in: alveoli of lungs,
walls of capillaries, kidney
glomeruli, and
serosae
Picture of alveoli of lungs.
 Simple cuboidal
epithelium
A single layer of cubeshaped cells
Found in: glands,
kidney tubules, ovaries
Kidney tubules
 Simple columnar
epithelium
A single layer of tall
shaped cells
Often contain mucusproducing Goblet cells
and / or cilia
Found in: digestive
tract (unciliated),
bronchi (ciliated), and
uterine tubes (ciliated)
Small intestine
 Simple columnar
epithelium
A single layer of tall
shaped cells
Often contain mucusproducing Goblet cells
and / or cilia
Found in: digestive
tract (unciliated),
bronchi (ciliated), and
uterine tubes (ciliated)
Uterine tube
 Pseudostratified
columnar epithelium
A single layer of cells
that differ in length.
Often contain cilia and
Goblet cells
Found in:
respiratory tract
trachea
 Pseudostratified
columnar epithelium
A single layer of cells
that differ in length.
Often contain cilia and
Goblet cells
Found in:
respiratory tract
Notice that the nuclei appear
at different levels.
For our purposes: nuclei at
different levels + cilia =
pseudostratified columnar
epithelia
trachea
 Stratified Squamous
Epithelium
Multiple layers of
epithelial tissue.
Flattened and atrophied
(‘dead’) at the apical edge;
but can be rounder at
basal edge.
Apical edge sloughs off
and is replaced.
Function: protection
from wear & tear
Found in skin, mouth,
esophagus
Esophagus?
 Transitional epithelium
Cells can change shape,
allowing the tissue to
stretch.
Apical cells appear round
when tissue is relaxed,
and flat with tissue is
stretched.
Found in urinary tract.
Ureter tube
 Transitional epithelium
Cells can change shape,
allowing the tissue to
stretch.
Apical cells appear round
when tissue is relaxed,
and flat with tissue is
stretched.
Found in urinary tract.
Notice that the cells
look rounded and
irregular.
Ureter tube
Show with fingers:
1)
2)
3)
4)
5)
Simple squamous
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Show with fingers:
1)
2)
3)
4)
5)
Simple squamous
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Notice the cube-like
shapes, and single layers
separated by basement
membrane
Show with fingers:
1)
2)
3)
4)
5)
Simple squamous
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Show with fingers:
1)
2)
3)
4)
5)
Simple squamous
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Notice the many layers,
and how the cells
gradually become flatter
Show with fingers:
1)
2)
3)
4)
5)
Pseudostratified columnar
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Show with fingers:
1)
2)
3)
4)
5)
Pseudostratified columnar
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Notice multiple layers,
cells rounded and
irregular
Show with fingers:
1)
2)
3)
4)
5)
Pseudostratified columnar
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Show with fingers:
1)
2)
3)
4)
5)
Pseudostratified columnar
Simple cuboidal
Simple columnar
Stratified squamous
Transitional
Notice the nuclei at
different levels, and the
cilia
 Examine the following tissues under a microscope:
 Simple cuboidal (kidney tubule)
 Simple columnar
(uterine
tube?)
Spend the
time to
do this right!!
 Stratified squamous (skin)
 Transitional
(bladder?)
Draw
carefully and
accurately. Use color. Compare to your
 Pseudostratified columnar
(trachea?)
textbook.
 As you observe these, create a histology guide by
ASK
FOR HELP
IF YOU
SURE IF& YOU
ARE SEEING
 sketching
each
tissueAREN’T
(USE COLOR
LABEL
IMPORTANT FEATURES).
IT!
 Jotting down any notes that will help you identify the
tissue
in the
You will
getfuture
to use these notes on a lab practical!
 Use your textbook to list both the FUNCTIONS and
LOCATIONS of the tissues.