Epithelial Tissue
Objectives •
•
•
•
types of epithelia
epithelia – positive diagnosis
covering epithelia -­ classification
identification of each type of covering epithelium
Epithelia -­ classification
• covering epithelia
• glandular epithelia
• sensorial epithelia
Epithelium – positive diagnosis:
-­ rich cellularity
-­ basal layer on basal lamina
-­ polarized tissue, occasionally with apical specializations
-­ no blood vessels
Covering epithelia -­ classification
• Number of layers – simple
– stratified
• Shape of cells
– squamous
– cuboidal
– columnar
Simple squamous epithelium
Simple squamous epithelium
Ross HM, Histology: A Text and Atlas, 4th ed.
Simple squamous epithelium,col. HE
Nuclei
Red blood cells
http://www.udel.edu/biology/Wags/histopage/colorpage/cbv/vls2.GIF
Postcapillary venule
Simple cuboidal epithelium,col. HE
Blood vessels
Brush border
Simple cuboidal epithilium
Kidney
http://stevegallik.org/sites/histologyolm.stevegallik.org/images/cuboidalepithelium_01.jpg
Simple cuboidal epithelium
Thyroid gland
http://ntp.niehs.nih.gov/nnl/endocrine/thyroid/images/
Simple columnar epithelium
Ross HM, Histology: A Text and Atlas, 4th ed.
Simple columnar epithelium
Ross HM, Histology: A Text and Atlas, 6th ed.
Stratified squamous epithelium
• non-­keratinized
• keratinized
Stratified squamous keratinized epithelium
Stratum corneum
Stratum lucidum
Stratum granulosum
Stratum spinosum
Stratum bazale
http://escholarship.org/uc/item/1qg46424/111902-­3b.jpg
Skin
Stratified squamous keratinized epithelium
Stratified squamous non-­keratinized
epithelium col. HE
Superficial layer
Intermidear layer
Basal layer
http://www.lab.anhb.uwa.edu.au/mb140/Big/oes40he.jpg
Stratified cuboidal epithilium col. HE
Connective tissue
Stratified cuboidal epithilium
www.studyblue.com
• respiratory epithelium
Pseudostratified cilindrical epithelium
Goblet cells
Ciliated cells
Cilia
Basale cells
http://stevegallik.org/images/Banner_Goblet.png
Pseudostratified cilindrical ciliated epithelium col. HE
Cilia
Goblet cells
Popescu LM, Ionescu N, Onicescu D, Atlas c olor de histologie, 1995
Connective tissue
Transitional epithelium(urothelium)
col. HE
“Rachet” cell
Umbrella-­like cell
Basal cell
Urinary bladder
www.studyblue.com