Epithelial Tissue
Guo Ze Yun
School of Anatomy and Histology & Embryology
Kunming Medical College
【Objectives】
1. To be able to identify and describe
A. Simple squamous epithelium
B. Simple cuboidal epithelium
C. Simple columnar epithelium
D. Pseudostratified ciliated columnar epithelium
E.Stratified squamous (keratinizing and nonkeratinizing
)
2. To understand the main features and functions of the
transitional epithelium
Questions
1.How to identify epithelial tissue in the section
cover the body surface
line the inner surface of various kinds of
tubes, cavities
and sacs.
be composed of much more cells (arrange tightly)
and small amounts of extracellular substance.
surface of blood vessel
Wall of blood vessel
epithelial tissue
connective tissue
Questions
1.How to identify epithelial tissue in the section?
2.How to classify epithelial tissue (covering
epithelium) in the section ?
Covering epithelium
Types of covering epithelium
Simple epi.: ---simple squamous epi.
---simple cuboidal epi.
---simple columnar epi.
---pseudostratified ciliated
columnar epi.
Stratified epi.: ---stratified squamous epi.
---stratified columnar epi.
---transitional epi.
Tip for identifying the epithelium
1.identify epithelial tissue in the section?
2. to classify epithelial tissue (covering epithelium)
in the section ?
3. Obsevering the histologic feature various
epithelium?
【Observation of tissue sections】
1.Simple squamous epithelium H & E , No .76
2. Simple cuboidal epithelium H & E No.76
3. Simple columnar epithelium H & E No.8
4. Pseudostratified ciliated columnar epithelium
No.66
5. Nonkeratinizing stratified squamous epithelium
No.9
6. Keratinizing (keratinized) stratified squamous
epithelium，Palm of the hand (thick skin)
No.71
1.NO. 9
nonkeratinized stratified squamous
epithelium(esophagus)
Epithelium
Connective tissue
nonkeratinized stratified squamous epithelium
superficial cells
middle layer cells
basal layer cells
connective tissue
distribute in
mouth, oral pharynx,esophagus,
true vocal cords ,vagina
Protect the organs against abrasion
2.No.71 keratinized stratified squamous epithelium
(skin)
epithelium
Connective tissue
Adipose tissue
keratinized stratified squamous epithelium
Dead cells :
---lack of nuclei and organlles.
---contain keratin
superficial cells
middle layer cells
basal layer cells
basement membrane
connective tissue
Distribute in skin, tympanic membrane, gingiva, hard
palate
nonkeratinized
esophagus
keratinized
skin
3.No.8 Simple columnar epithelium
(gollbladder )
Stratid boder
What is the striated boder?
Function?
epithelium
Connective tissue
4.No.76 Simple cuboidal epithelium
kidney
Renal
corpuscle
glomerulus
Bowman’s
capsule
Renal
tubules
Simple squamous epithelium
Simple cuboidal epithelium
5.No.66 Pseudostratified ciliated columnar epithelium
trachea
epithelium
connective
cartilage
Cilium
Columnar cell
Goblet cell
CT
trachea
【Demonstration slides】
Simple squamous epithelim
Top view (silver staining )
Transitional epithelium (urothelium)
facet cell dome-shape
urinary bladder
in relaxed state
(empty)
urinary bladder
in distended state
(full)
Can you identify them now ?
【Homework】
Draw the picture of the simple
squamous epithelium diagram