4 tissue - 4-1Histology: The Study of Tissues4-2Tissues and

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Unformatted text preview: 4-1Histology: The Study of Tissues4-2Tissues and Histology•Tissue classification:•structure of cells•extracellular matrix•cell function•4 primary tissue types•Epithelial •Connective•Muscle•Nervous4-3Embryonic Tissue•Germ layers•Endoderm–Inner layer–Forms lining of digestive tract and derivatives•Mesoderm–Middle layer–Forms tissues as such muscle, bone, blood vessels•Ectoderm–Outer layer–Forms skin and neuroectoderm4-4Epithelium Characteristics•Epithelium:protective covering of surfaces inside and outside the body.•Covers body surfaces and forms glands•Outside surface of the body•Lining of digestive, respiratory and urogenital systems•Heart and blood vessels•Linings of many body cavities•Has free(apical), basal, and lateralsurfaces•Basement membrane– attached to the basal surface -formed by secretions of both epithelium and connective tissue. Acellular “glue”•Avascular4-5CapillaryConnectivetissueBasementmembraneNucleusFree surfaceEpitheliumLateral surfaceBasal surface4-6Functions of Epithelia•Protecting underlying structures; e.g., epithelium lining the mouth•Acting as barriers; e.g., skin•Permitting the passage of substances; e.g., kidney – filter toxins•Secreting substances; e.g., pancreas•Absorbing substances; e.g., lining of small intestine4-7Cell Surface Modifications•Microvilli (brush border):Increase surface area absorption or secretion•Cilia:move materials across cell surfacemicrovilliLateral surface4-8...
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This note was uploaded on 12/03/2009 for the course KINESIOLOG 1Y03 taught by Professor Parises during the Spring '09 term at McMaster University.

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4 tissue - 4-1Histology: The Study of Tissues4-2Tissues and

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