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tissues transes.docx - Tissues & Histology ANAPHY | WEEK #4...

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DIANA MICAELLA C. ZARATissues & HistologyANAPHY | WEEK #4Tissues- collections of similar cellsand the substancessurrounding themTissue classification based on structureof cells, compositionof noncellular extracellular matrix, andcell function• Major types of adult tissues– Epithelial– Connective– Muscle– Nervous• Histology: Microscopic Study ofTissues.Biopsy: removal of tissues fordiagnostic purposesAutopsy: examination of organsof a dead body to determine cause ofdeathEMBRYONIC TISSUE• 3 major germ layers that form theembryonic disc (source of stem cells)Endoderm• Inner layer• Forms lining of digestive tract andderivativesMesoderm• Middle layer• Forms tissues as such muscle, bone,blood vesselsEctoderm• Outer layer• Forms skin and neuroectodermEPITHELIAL TISSUECellularity- Consists almostentirely of cells• Covers body surfaces, lineshollow organs, and forms glands– Outside surface of the body– Lining of digestive, respiratoryand urogenital systems– Heart and blood vessels– Linings of many body cavitiesPolarity- Has apical, basal, andlateral surfaces• Rests on a basement membrane• Specialized cell contacts bindadjacent cells togetherAvascular- no blood vesselsRegenerative-Replaces lost cellsby cell division.FUNCTION OF EPITHELIAL• Protecting underlying structures;e.g., epithelium lining the mouth• Acting as barriers; e.g., skin• Permitting the passage ofsubstances; e.g., cells lining air sacs inlungs and nephrons in kidney• Secreting substances; e.g. pancreaticcells• Absorbing substances; e.g., lining ofstomach and small intestine.SPECIAL CHARACTERISTIC1
DIANA MICAELLA C. ZARATissues & HistologyANAPHY | WEEK #4CLASSIFICATION OF EPITHELIUM• Number of layers of cellsSimple- one layer of cells. Eachextends from basement membraneto the free surfaceStratified- more than one layer.Pseudostratified- tissue appears tobe stratified, but all cells contactbasement membrane so it is in factsimple• Shape of cellsSquamous- flat, scale-likeCuboidal- about equal in height andwidthColumnar- taller than wideCLASSIFICATION OF EPITHELIASIMPLE SQUAMOUS EPITHELIUMDESCRIPTION: A SINGLE LAYER OFFLATTENED CELLS WITH DISC-SHAPEDCENTRAL NUCLEI.FUNCTION: ALLOWS PASSAGE OFMATERIALS BY DIFFUSION ANDFILTRATION. SECRETES LUBRICATINGSUBSTANCES IN SEROSAE.LOCATION: KIDNEY GLOMERULI ANDCORPUSCIES; AIR SACS OF LUNGS;LINING OF HEART; BLOOD VESSELS,AND LYMPATHIC VESSELSSIMPLE CUBOIDAL EPITHELIUMDESCRIPTION: CUBELIKE CELLS WITHLARGE, SPHERICAL CENTRAL NUCLEI.FUNCTION: SECRETION ANDABSORPTION.LOCATION: KIDNEY TUBULES; DUCTSAND SECRETORY PORTIONS OF SMALLGLANDS; OVARY SURFACE.SIMPLE COLUMNAR EPITHELIUMDESCRIPTION: TALL CELLS WITHROUND TO OVAL NUCLEI. SOME CELLSBEAR CILIA.

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Term
Fall
Professor
JOEMAR SUBONG
Tags
Collagen, Tissues Histology

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