Term
| The main functions of epithelia are _____. |
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Definition
| protection, secretion, absorption, sensory, and transport |
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Term
| Epithelia is derived from primitive cell layers of _____. |
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Definition
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Term
| Epithelial cells are primarily derived from _____. |
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Definition
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Term
| Epithelial cells have a _____ shape. |
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Definition
| polygonal (square, rectangles) |
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Term
| Epithelial cells are attached to neighboring cells through _____. |
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Definition
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Term
| Epithelial cells are anchored to the basement membrane by _____. |
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Definition
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Term
| There are no _____ within the epithelium. Nutrients diffuse from vessels in the underlying CT through the basement membrane. |
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Definition
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Term
| Epithelial cells can be classified based on _____. |
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Definition
| shape, number of layers, and any modifications |
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Term
| The shapes of epithelial cells are _____. |
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Definition
| squamous (flat), cuboidal (square), columnar (rectangular) |
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Term
| There are three layer classifications of epithelial cells: |
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Definition
| simple (1 layer), stratified (many layers), and pseudostratified (one layer but looks like many) |
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Term
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Definition
| short, hard to see, non-motile, function to increase surface area of absorption |
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Term
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Definition
| only found on simple (or pseudostratified) cells |
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Term
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Definition
| long, easier to see, motile |
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Term
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Definition
| only found on simple (or pseudostratified) cells |
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Term
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Definition
| long microvilli, non-motile |
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Term
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Definition
| UNCOMMON; found in epidiymis, inner ear |
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Term
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Definition
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Term
| Goblet cells have a _____ shape. |
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Definition
| modified columnar: wide top, narrow base |
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Term
|
Definition
| make mucous to protect epithelium, trap debris, lubrication |
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Term
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Definition
| only found on simple (or pseudostratified) cells |
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Term
| Simple Squamous Epithelia |
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Definition
| single layer of squamous cells; very fragile |
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Term
| Simple Squamous Epithelia |
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Definition
| lines blood vessels, body cavities, posterior surface of cornea, kidney tubules |
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Term
| Stratified Squamous Epithelia |
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Definition
| multiple layers of squamous cells: deeper cells are more cuboidal, flattened as they get closer to top; more resistant to friction |
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Term
| Stratified Squamous Epithelia |
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Definition
| found in the oral cavity, pharynx, esophagus, anal canal, uterine cervix, vagina, cornea |
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Term
| Keratinizing Stratified Squamous Epithelia |
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Definition
| like stratified squamous except superficial cells die (keratinize) and leave behind their skeleton (keratin) |
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Term
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Definition
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Term
|
Definition
| retained nuclei in keratin |
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Term
| Keratinizing Stratified Squamous Epithelia |
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Definition
| found on skin, oral cavity, esophagus, forestomachs of herbivores |
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Term
| Simple Cuboidal Epithelia |
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Definition
| single layer of cuboidal cells |
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Term
| Simple Cuboidal Epithelia |
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Definition
| found in kidney tubules, pancreas, salivary gland, ducts |
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Term
| Stratified Cuboidal Epithelia |
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Definition
| 2 or more layres of cuboidal cells; uncommon |
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Term
| Stratified Cuboidal Epithelia |
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Definition
| found in salivary ducts & apocrine ducts |
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Term
| Simple Columnar Epithelia |
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Definition
| single layer of columnar cells; nuclei are often lined up (apical - top, basal - bottom) |
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Term
| Simple Columnar Epithelia |
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Definition
| found in intestines & gall bladder |
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Term
| Simple Columnar Epithelia with Cilia |
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Definition
| single layer of columnar cells; most have cilia |
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Term
| Simple Columnar Epithelia with Cilia |
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Definition
| uncommon; found in female repro tract |
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Term
| Pseudostratified Columnar Epithelia |
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Definition
| single layer of columnar cells but it may look like multiple layers because nuclei are not lined up |
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Term
| Pseudostratified Columnar Epithelia |
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Definition
| found in respiratory tract |
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Term
| Stratified Columnar Epithelia |
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Definition
| 2 or more layers of columnar cells; often bottom is more cuboidal |
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Term
| Stratified Columnar Epithelia |
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Definition
| rare; found in conjuctiva & salivary gland ducts |
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Term
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Definition
| can transition between more stratified cuboidal & more stratified squamous lining; more resistant to the irritating effects of urine |
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Term
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Definition
| found only in urinary tract |
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Term
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Definition
| secrete directly into the blood stream - no ducts! |
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Term
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Definition
| thyroid, pituitary, islets of langerhans |
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Term
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Definition
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Term
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Definition
| exocrine pancreas, salivary glands, sweat glands |
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Term
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Definition
| Goblet cells, Enterochromaffin cells (GI, endocrine) |
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Term
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Definition
| lined by simple cuboidal (or columnar) epithelium; secretory component dumps secretions into a duct |
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Term
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Definition
| duct doesn't branch; secretory component may or may not branch |
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Term
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Definition
| duct does branch; secretory component usually branches |
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Term
| Tubular Secretory Component |
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Definition
| arranged along a tube; may be straight (stomach, colon), coiled (skin, foot pads), branched (stomach) |
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Term
| Acinar (Alveolar) Secretory Component |
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Definition
| arranged around a sphere; found in pandreas & salivary gland |
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Term
| Tubuloalveolar Secretory Component |
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Definition
| combination; found in salivary gland, mammary gland |
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Term
| Merocrine Method of Secretion |
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Definition
| membrane-bound secretory vesicles form in cytoplasm, fuse with luminal cell membrane to release contents outside cell; can't be seen with light microscopy, very common |
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Term
| Merocrine Method of Secretion |
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Definition
| found in salivary glands, pancreas, eccrine sweat glands |
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Term
| Apocrine Method of Secretion |
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Definition
| membrane bound pieces of top of cell pinch off; can be seen with light microscopy |
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Term
| Apocrine Method of Secretion |
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Definition
| found in mammary gland, apocrine (sweat) glands, ceruminous glands (ear wax) |
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Term
| Holocrine Method of Secretion |
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Definition
| entire cell "falls off" and becomes secretory product; can be seen with light microscopy |
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Term
| Holocrine Method of Secretion |
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Definition
| found in sebaceous glands |
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Term
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Definition
| watery; cells may have pink secretory granules concentrated toward top of cell, round nuceus |
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Term
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Definition
| found in pancreas & salivary gland |
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Term
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Definition
| viscous; foamy cytoplasm; nucelus displaced basally & flattened |
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Term
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Definition
| found in salivary glands, stomach |
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Term
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Definition
| found in mixed salivary glands |
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Term
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Definition
| layer of flat cells with contractile activity that lies between secretory cells & basement membrane; move secretions from acinus to the duct |
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