This document discusses different types of epithelial tissues. It describes three types of epithelial layers - simple, stratified, and pseudostratified/transitional. The different cell shapes that can make up the top layer are also defined. Specific locations and examples of each type of epithelium are provided.

1. By: Steph , Lindsey, Kerri, Sam, Steffi, and Katie

2.  Count the layers
 Simple: 1 layer
 Stratified: looks and is several layers
 Pseudostratified / Transitional: Looks like several
layers, but all the cells contact the basement membrane
 What cell is on the top layer?
 Squamous: Flat (scaly)
 Cuboidal: about as wide as it is tall
 Columnar: much taller than it is wide

3.  Singlelayer of thin squamous cells resting on
a basement membrane
 Location:
 Air sac of lungs
 Forms the walls of capillaries
 Forms serous membranes
 Membranes that lines the ventral body cavity and
cavity and covers the organs inside it

4. This shows single
layers of
squamous (flat)
cells around the
air spaces
(alveoli) of the
lung.

5.  Location
 Common in glands and
their ducts
 Forms walls of kidney
tubules
 Covers surface of
ovaries
• A cluster of ducts in the pancreas
• Top layer of the cell is as wide as it is
thick

6.  Location
 Line entire length of the digestive track from
stomach to anus
Located in digestive tract

7.  Nonciliated type in male’s sperm-carrying
ducts of large glands; ciliated variety lines
the trachea, most of the upper respiratory
tract

8. 1.Cilia
2.Mucus of goblet
cell
3.Pseudostratified
epithelium layer
4.(under three)
Basement
membrane
5.(under four)
connective tissue

9.  Nonkeratinized type forms the moist linings
of the esophagus and mouth; keratinized
variety forms the epidermis of the skin, a dry
membrane.

10. Little black dots
nuclei, mid-section
stratified squamous
epithelium, right below
that basement
membrane, lastly
connective tissue

11.  Lines
the ureters, bladder, and part of the
urethra
Top pinkish purple is the
transitional
epithelium, and then the
lighter purple is the
basement
membrane, then
connective tissue

13. Impetigo

14. a superficial skin infection characterized by
pustules and caused by either Staphylococci or
Streptococci.

15. pustule Staphylococc
i Streptococ
ci

16. pustule
Stratified Squamous Epithelium
Cross section of
skin

23. • Inflammatory, chronically
relapsing, non-contagious and itchy
skin disorder
• Type of eczema
• Also known as "prurigo Besnier,"
"neurodermitis," "endogenous
eczema," "flexural eczema,"
"infantile eczema," and "prurigo
diathésique

24.  Cause is genetic
 Aggravated by
contact or intake
of allergens
 Also influenced by
other factors
affecting the
immune system
 Ex. stress and
fatigue

25.  Idiopathic- no certain
cause
 Changes in at least 3
groups of genes
encoding structural
proteins, epidermal
proteases and
protease inhibitors
may lead to a
defective epidermal
barrier

26.  can’t keep in moisture
 can’t keep out irritants
 disturbs the formation
of natural skin oils
 reduces sweat secretion
 skin can become so dry
that it cracks and
fissures develop
 allowing bacteria and
irritants to penetrate the
skin
 possibly cause infection