dr. anand srinivasan. consists of large number of cells classified based on size, shape and...
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Dr. ANAND SRINIVASAN
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Consists of large number of cells
Classified based on size, shape and functions Epithelial tissue Connective tissue Muscle tissue Nervous tissue
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Group of tissue that covers the body and lining cavities, hollow organs and tubes.
Functions Protection Secretion Absorption
Cells lie on basement membrane
Less matrix (intercellular substance)
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Simple : single layer of cells Simple squamous Simple cuboidal Simple columnar Pseudostratified ciliated columnar
Stratified : several layers of cells Stratified squamous keratinized epithelium Stratified squamous non keratinized
epithelium Transitional epithelium
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Single layer of flattened cells E.g. lining epithelium of heart, blood
vessels, alveoli of lungs.
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Cube shaped cells lying on a basement membrane E.g. Proximal convoluted tubule, Thyroid
follicle
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Single layer of cells, rectangular in shape, on a basement membrane E.g. lining epithelium of Stomach,
Intestines
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Single layer of cells on basement membrane but has its cell nuclei similar to stratified epithelium E.g. Trachea
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Composed of number of layers of cells
Superficial layer are squamous
2 types KERATINIZED▪ Superficial layer consists of dead epithelial cells that
contain a protein ‘KERATIN’▪ Found on dry areas▪ E.g. Skin
NON KERATINIZED▪ Superficial layer does not contain keratin▪ Found on wet areas▪ E.g. Oesophagus, Cornea
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Several layers of pear shaped cells E.g. Urinary bladder, ureter, urethra