Term
| characteristics of epithelium |
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Definition
form tight sheets
cover external body surface
all substances entering/leaving body must cross sheet
vital role in immune/inflammatory response
1st line of defense
no blood vessels, but has nerves |
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Term
| nonkeratinized epithelium |
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Definition
have nuclei
protection against dessication, abrasion, chemical and bacteria
found in esophagus, vagina, cornea and oral cavity |
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Term
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Definition
no nuclei
protects against environment, dessication, abrasion, chemical and bacteria
found in epidermis of skin, some regions of gingiva and hard palate |
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Term
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Definition
free surfaces of cell
faces internal space/lumen or external environment
has microvilli, cilia, and sterocilia |
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Term
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Definition
contain microtubules
project into lumen
increase surface area
foundin small intestine and corneal epithelial cells |
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Term
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Definition
contain microtubles and proteins that allow movement/beating
move particles along lumen
found in oviduct and respiratory tract |
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Term
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Definition
contain microfilaments
found in hair cells of middle ear and epididymal duct of male testes |
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Term
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Definition
cell-cell contact
has occluding junctions, anchoring junctions,and communicating junctions |
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Term
| occluding junctions or tight junctions |
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Definition
located where two cells touch near lumen
regulate paracellular pathway/movement of ions btwn cells |
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Term
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Definition
| desmosomes/macula adherens and zonula adherens |
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Term
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Definition
aka macula adherens
connect outside of cell to keratin inside cell |
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Term
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Definition
zone of adhesion btwn cells
holds cells together by connecting outside of cell to actin filaments inside cell |
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Term
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Definition
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Term
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Definition
| channels in plasma membrane |
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Term
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Definition
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Term
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Definition
anchoring junction found only when cell touches basal lamina
connects basal lamina outside cell to keratin intermediate filaments inside cell |
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Term
| epidermal ridges/rete pegs |
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Definition
found in some part of gingiva and hard palate
columns of epithelium cells grow into connective tissues
surrounded by basal lamina
function to hold sheet to connective tissues in areas of high friction or abrasion |
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Term
| epidermal ridges/rete pegs |
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Definition
found in some part of gingiva and hard palate
columns of epithelium cells grow into connective tissues
surrounded by basal lamina
function to hold sheet to connective tissues in areas of high friction or abrasion |
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Term
| cytoskeleton of epithelial cells |
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Definition
actin
microtubules
keratins |
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Term
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Definition
aka intermediate filaments, cytokeratins, tonofiliments, and tonofibrils
epithelial cell disease may involve problems w/this function |
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