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| Cells responsible for main functions of typical organs |
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| what are the four main tissue types? |
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| epithelium, connective, muscle and nerve |
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| composed of closely aggregated polyhedral cells with little ECM. Main functions are barrier, secretion and absorption |
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| the interface between the epithelium and the underlying tissue |
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| the layer of connective tissue that supports the epithelium and provides nutrition to neighboring structures. epithelia that line the cavity of internal organs mostly rest on this. |
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| irregularities in the connective tissue surfane that form small invaginations to increase SA contact with epithelium. found mostly in epithelial tissues subject to a lot of stress such as the skin and tongue. |
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| portion of epithelial cells which faces the connective tissue |
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| surface of epithelial cells that normally faces a space |
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| the surface of the apical pole on epithelial cells |
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| the surface of epithelial cells that are apposed to neighbor cells |
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EC material that separates epithelial tissue from connective tissue. Visible only by TEM. not only found in epithelial tissue that contact connective tissue but also in muscle, adipose and schwann cells that contact connective tissue.
the main components are type IV collagen, glycoproteins laminin and entactin, and proteoglycans. |
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| reticular fibers closely associated with the basal lamina. the fibers are produced by the CT |
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| PAS-positive, usually formed by the association of either two basal laminae or basal lamina and a reticular lamina. visible under light microscope. |
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| tight junction (zonulae occludens) |
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| most apical of junctions, forms a band around the cell. forms a seal that prevents the flow of material between epithelial cells in either direction |
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| junctions that encircles the cell and provides the adhesion of one cell to another. made up of actin filaments |
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| Gap Junctions ( communicating junctions) |
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occur anywhere on lateral surface of epithelial cell. patches that contain intercellular channels ( connexons)
[image] |
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| desmosome ( macula adherens) |
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| disk shaped structure at the surface of one cell that is matched with an identical structure at the surface of the adjacent cell. junctions link to intermediate filaments in the cell. usually is a space between the cell membranes |
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| half a desmosome that bind the epithelial cell to the basal lamina |
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projections found on the free surface of an epithelial cell. abundant in cells that have high absorption. made up of clusters of actin filaments.
[image] |
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| cylindrical motile structures on the surface of some epithelial cells. surrounded by a cell membrane and have a 9+2 microtubule structure. permit movement of fluid or particulate matter to be propelled in one direction over the epithelial surface. [image] |
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| a layer of cells for a boundary between a surface and the underlying tissue |
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| the epithelial cells form a gland that is specialized for secretion |
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| one layer of epithelial cells. squamous, cuboidal, columnar |
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| more than one layer of epithelial cells. keritinized, non-keritinized |
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| pseudostratified epithelium |
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| appears stratified but is actually simple epithelium |
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| epithelium that lines blood and lymph vessels |
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| epithelium that lines certain body cavities |
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| stratified squamous epithelium |
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| found mainly in places subject to attrition ( mouth, skin, esophagus, vagina). cells form in many layers as the move up towards the surface the become irregular in shape and flatten. |
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| lines the urinary bladder,ureter, and upper part of the urethra. characterized by domelike cells that is neither squamous nor columnar. change shape according to the distention of the bladder. |
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| epithelia formed by cells specialized to produce secretion.may synthesize, store and secrete proteins, lipids, or complexes of carbs and proteins |
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| small membrane bound vesicles in which molecules to be secreted in glandular epithelia cells. |
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| glands that retain their connection witht the surface epithelium from which they originated. tubular ducts lined with epithelial cells in which glandular secretions pass to reach the surface. |
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| glands whose connection to the surface is lost during development. ductless glands. secretions go to target site via transportation in the blood stream. |
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| gland with one unbranched duct |
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| glands that have repeated branching ducts |
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| secretory granules leave the gland via exocytosis with no loss of cellular material |
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| the product of secretion is shed with the whole cell |
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| secretory product is discharged together with parts of of the apical cytoplasm |
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| nerual and endocrine control of glands occurs through these |
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