epithelium- practical part -...
TRANSCRIPT
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Dr. Heba KalbounehAssistant Professor of Anatomy and Histology
Epithelium- practical part
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Types of Simple Epithelium
Simple
squamous
Simple
cuboidal
Simple
columnar
Pseudostratified
columnar
Mesothelium Ciliated Ciliated
Endothelium Non Ciliated
(Microvilli)
With stereocilia
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Simple Squamous Epithelium
Location: endothelium, mesothelium, lung alveoli
![Page 4: Epithelium- practical part - Weeblyjumed16.weebly.com/uploads/8/8/5/1/88514776/epithelium-lab3-2017.pdf · Epithelium- practical part. ... Simple cuboidal Simple columnar Pseudostratified](https://reader033.vdocuments.us/reader033/viewer/2022051407/5afaba9a7f8b9a2d5d8ea7d2/html5/thumbnails/4.jpg)
Functions of Simple Squamous Epithelium
Permits bidirectional movement of gases, fluids and nutrients from the free surface to underlying tissue
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Naming of the simple squamous epithelium
depends on the location:
• Endothelium is the lining of the blood vessels,
lymph vessels and the heart.
• Mesothelium is the epithelium forming serous
membrane lining internal body cavities:
Peritoneum, Pleura and Pericardium.
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Endothelium
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Endothelium
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Mesothelium
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Mesothelium
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Mesothelium
Endothelium
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Simple Cuboidal
Location
Small ducts of certain glands (pancreas & salivary), kidney tubules
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Simple Cuboidal Epithelium
• Structure
– Single layer of cube shaped cells
• Function
– Secretion and absorption.
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`
Simple cuboidalSimple squamous
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Simple Columnar Epithelium
Microvilli
Location
Small intestine, Stomach, Gall
bladder, fallopian tube
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Simple Columnar Epithelium
With microvilli With cilia
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Function of Simple Columnar Epithelium
Engaged in the protection of wet surfaces, absorption and secretion.
When ciliated (Fallopian tube), it helps in movement of fluid in the female genital tract.
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22
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23
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Goblet Cells
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Pseudostratified Columnar Epithelium
Location: Respiratory tract (trachea and bronchi)
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Pseudostratified columnar
Epithelium• Structure
– Irregularly shaped cells with nuclei at different levels – appear stratified, but aren’t.
– All cells reach basement membrane
• Function
– Absorption and Secretion
– It entraps foreign particles in the respiratory tract.
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Respiratory Epithelium
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Types of Stratified Epithelium
Stratified Squamous
Keratinized
Non Keratinized
Stratified cuboidal
Stratified columnar
Transitional epithelium
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Stratified Squamous Non keratinized Epithelium
Location: Oral cavity, Esophagus, Anal canal, Vagina
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Stratified Squamous Keratinized Epithelium
Location: Epidermis of skin
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Location : Larger ducts of certain exocrine glands
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Location : Conjunctiva, larger ducts
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Transitional Epithelium
Location: Urinary tract (urinary bladder and ureters)
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Stretched (distended
organ)
Fluid pressure
Unstretched (empty
organ)
Superficial layer of
dome/umbrella-shaped cells
Transitional Epithelium
Function
- Allows stretching (change size)
- Protection
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Binucleated cell
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Dome-shaped cells
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Features of Apical surface
of Epithelium
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Microvilli/ LM
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Microvilli/ TEM
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Cilia/ LM
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Cilia/ TEM
9 + 2
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Cilia
Microvilli
Scanning EM
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Stereocilia