HISTOLOGY EPITHELIUM CELLS. Stem Cells Early cells that are not programmed yet As development of the...
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Transcript of HISTOLOGY EPITHELIUM CELLS. Stem Cells Early cells that are not programmed yet As development of the...
![Page 1: HISTOLOGY EPITHELIUM CELLS. Stem Cells Early cells that are not programmed yet As development of the organism occurs, these stem cells become specialized.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f255503460f94c3bd78/html5/thumbnails/1.jpg)
HISTOLOGY
EPITHELIUM CELLS
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Stem Cells
• Early cells that are not programmed yet
• As development of the organism occurs, these stem cells become specialized.
• RISK: If function of the body rely on specialized cells, if those cells are destroyed or disabled, it could lead to disaster for the organism
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Primary Tissue
• Tissue: Cells with the same function and structure.
• There are four primary tissues:– Epithelium– Connective– Nervous– Muscle
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EPITHELIAL TISSUE
• Specialized Characteristics– Fit closely together to form sheets
• Lots of tight junctions
– One surface exposed to body’s exterior or cavity– Basement Membrane
• Foundation for new cells
– Avascular• No blood supply of their own• Depend on Diffusion (Capillaries)
– Regenerate Easily
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Epithelium Classification
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Simple Squamous Epithelium• “Floor Tiles” Filtration, Diffusion
• Serous membranes, O2 and CO2 Diffusion, Capillaries
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Simple Squamous Epithelium
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Simple Cuboidal Epithelium• Glands, Ducts, Salivary Glands • One layer of cuboidal cells resting on a basement membrane
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SIMPLE CUBOIDAL Epithelium
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Simple Cuboidal Epithelium
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Simple Columnar EpitheliumGoblet cells produce a lubricating mucus. Digestive Tract, Mucous membranes.
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Simple Ciliated Columnar Epithelium
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Pseudostratified Ciliated Epithethium
• Respiratory Tract; nuclei appear at different heights
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Stratified Squamous Epithelium• Abuse/Friction, esophagus, mouth, outer skin
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Stratified Squamous Epithelium
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Stratified Squamous Epithelium
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Stratified Cuboidal Epithelium• Usually found with 2 layers being cuboidal• Ducts of glands
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Stratified Cuboidal Epithelium
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Stratified Cuboidal Epithelium
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Stratified Columnar EpitheliumDucts of large glands, basal cells vary in size. RARE
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Transitional Epithelium• Highly modified, urinary bladder, ureters,
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Transitional Epithelium