Histology

What does a nucleus contain?
What is the characteristics of the nucleus? (4)

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What are inclusions?

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What is the mitochondria?

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What are the different types of cell junctions?

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What are desmosomes?(3)

-released and reattached between neighboring cells
-uses tonofibrils (don't cross into other cell but loops back)
-attachment plaques

What are hemidesmosomes?(2)

-Cellular to noncellular surface
-epith cell to basal lamina of basement membrane or JE to tooth

How do epithelial cells attach to one another?
Where do epithelial cells get their nourishment from?

-desmosomes
-do NOT contain blood vessels
-get nourishment from vessels in underlying CT

What is the difference between tight junctions and gap junctions?

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Difference between desmosomes (3)and hemidesmosomes(3) in epithelial tissue?

desmosomes
-button like adhesion disk (snap or velcro)
-cell to cell connection
-found in gingival epithelium
Hemidesmosome
-half desmosome
-cell to basal lamina connection (non cellular)
-found in gingival epithelium or JE

What is intercellular substance? (4)

-(glue) holds cells together
-exchange of nutrients and waste between cells
-amount and kind varies; some tissues have both types
-produced by cells

What are the two type of IS?
What is a common substance in IS?

Fibrous
-formed elements
-4 types of fibers
Amorphous (g.s)
-no shape
-mucopolysaccharides
-hyaluronic acid

What are the characteristics of tissue fluid? (4)

medium of exchange
-most derived from plasma
-carries waste and nutrients between blood cells and blood vessels and or IS
-varies in amount according to type of tissue
-excess=edema

What are the primary germ layers?

-ectoderm
-mesoderm
-endoderm

Where is the ectoderm found? (5)

-skin
-lining of oral and nasal cavity
-enamel
-salivary glannds
-nerves

Where is mesoderm found?(4)

-skeleton
-muscles
-blood (connective tissues)
-some internal organs

What are the different types of tissues?
What is the only organ that has all 4?

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What is muscle tissue composed of? what are the characteristics of muscle? (3)

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What is nerve tissue composed of?

MOSTLY CELLS
-function is to transmit impulses

What are the two different types of nerve endings?

Free
-mostly in pulp and oral epithelium
-PAIN
Encapsulated
-in connective tissue and periodontal ligament (also contains some free endings)
-TOUCH

What are the characteristics of epithelial tissues? (2)

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What are the functions of epithelial tissues? (4)

-formative-ectoderm-enamel
-protective-covers outer sufaces
-resorption-digestion, lines inner surfaces
-secretion-lubricate, transport, reception of stimuli (taste cells), glands

What supplys the blood to the gingiva?

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