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PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoStratified epithelial tissue has multiple layers of cells and is classified as
- Stratified columnar epithelial tissue
- Stratified squamous epithelial tissue
- Stratified cuboidal epithelial tissue
- Stratified ciliated columnar epithelial tissue
1. Stratified columnar epithelial tissue:
It is made up of tall, cylindrical pillar-like cells with multiple layers.![shutterstock_418975867.jpg](https://resources.cdn.yaclass.in/e9bda8d3-457c-49fb-8f4e-4d01ba7713b5/shutterstock418975867w400.jpg)
Stratified columnar epithelial tissue
Location: Linings of the urethra, a tube connects the kidneys and urinary bladder through which urine excretion happens.
Function: It helps to protect the underlying tissues. They often perform a role of limited secretion, depending on the tissues' location.
2. Stratified squamous epithelial tissue:
Location of these tissues are subjected to wear and tear. So, rapid regeneration of cell will occur.
![1200px-Epithelial_Tissues_Stratified_Squamous_Epithelium_(40230838950).jpg](https://resources.cdn.yaclass.in/acf8c476-d48c-4789-a782-a2e6bfa0723a/1200pxEpithelialTissuesStratifiedSquamousEpithelium40230838950w400.jpg)
Stratified squamous epithelial tissue
It is classified into two types.
a. Keratinised stratified squamous epithelium
b. Non-keratinised stratified squamous epithelium
a. Keratinised stratified squamous epithelium
Outer layers contains a protein called keratin, which is hard and waterproof
Location: Skin epidermis, hair, nails.
![shutterstock_159810449.jpg](https://resources.cdn.yaclass.in/2f815011-a912-4524-a60f-5426ba774057/shutterstock159810449w400.jpg)
Keratinised stratified squamous epithelium
Function: This tissue gives protection from abrasion and infection. Also, it helps to prevent the drying of the underlying tissue.
b. Non-keratinised stratified squamous epithelium
Outer layers do not contain keratin. This tissue don't prevent water loss.
Location: Cornea, oral cavity, linings of oesophagus, rectum and internal portion of lips.
![Thuc_quan.jpg](https://resources.cdn.yaclass.in/b860f89d-5b42-4bf0-8986-06140bea422f/Thucquanw400.jpg)
Non-keratinised stratified squamous epithelium
Function: Mucus is secreted by non-keratinized epithelia as an extra defensive and lubricating layer.
3. Stratified cuboidal epithelial tissue:
This tissue has cube-shaped cells with multiple layers.
![Stratified_cuboidal_epithelium_animated (1).gif](https://resources.cdn.yaclass.in/7a856b32-07d9-47c5-9716-a59ea49d5f71/Stratifiedcuboidalepitheliumanimated1.gif)
Stratified cuboidal epithelial tissue
Location: Linings of sweat gland ducts, salivary and pancreatic ducts. The epidermis of fish is made of this tissue.
Function: They protect sweat gland ducts, mammary glands, and salivary glands.
4. Stratified ciliated columnar epithelial tissue:
This tissue has ciliated and cylindrical shaped cells present in the outer and basal layers of the tissue.
![f6fbef6600ab5d17bea151163e07ebd8.jpg](https://resources.cdn.yaclass.in/1ec6daa1-2da9-4795-8600-10378369b58a/f6fbef6600ab5d17bea151163e07ebd8w400.jpg)
Stratified ciliated columnar epithelial tissue
Location: Linings of larynx and upper part of the soft palate.
Function: Secretion or absorption
![423_Table_04_02_Summary_of_Epithelial_Tissue_CellsN.jpg](https://resources.cdn.yaclass.in/1bbfbb01-4225-4964-b1f2-8db7cff2d0d1/423Table0402SummaryofEpithelialTissueCellsNw681.jpg)
Summary of epithelial tissue cells
Glandular epithelial tissue:
Glands carry out the secretion of useful substances such as enzymes and hormones in an animal body. These are developed from epithelial tissue.
A portion of epithelial cells folds inward, which results in the formation of a multicellular gland. It is called glandular epithelium.
Location: It is found in the stomach, intestine and pancreas.
![BeFunky-collage (14).jpg](https://resources.cdn.yaclass.in/4d028d10-aa6e-4777-a66e-1c875351ebd5/BeFunkycollage14w658.jpg)
Glandular epithelial tissue
Function: It involves the synthesis and secretion of chemical substances at the epithelial surface.
Important!
Based on the epithelial layers
- Simple - Single layer
- Stratified - More than one layer
- Ciliated - Cells with cilia
Based on the cell shapes
- Squamous - Flat
- Cuboidal - Cube
- Columnar - Rectangular
Reference:
https://commons.wikimedia.org/wiki/File:Epithelial_Tissues_Stratified_Squamous_Epithelium_(40230838950).jpg
https://commons.wikimedia.org/wiki/File:Thuc_quan.jpg
https://upload.wikimedia.org/wikipedia/commons/c/c2/Stratified_cuboidal_epithelium_animated.gif
https://en.wikipedia.org/wiki/Epithelium#/media/File:423_Table_04_02_Summary_of_Epithelial_Tissue_CellsN.jpg
https://upload.wikimedia.org/wikipedia/commons/7/7e/Glandular_epithelium_of_small_intestine_%28crypts_of_Lieberk%C3%BChn%29.jpg
https://commons.wikimedia.org/wiki/File:Figure_33_02_03.jpg