Histo Exam 3

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components of saliva

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components of saliva

glycoproteins (mucin), proteins (gustin and enzymes), ions, immunoglobulins

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<p><span style="font-family: Source Sans Pro, sans-serif">Which of the following sensory mechanoreceptors can be seen in the histological image?</span></p>
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<p><span style="font-family: Source Sans Pro, sans-serif">Which of the following sensory mechanoreceptors can be seen in the histological image?</span></p>

Which of the following sensory mechanoreceptors can be seen in the histological image?

pacinian corpuscle

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<p>what type of burn is this?</p>
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<p>what type of burn is this?</p>

what type of burn is this?

3rd degree, full thickness

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<p><span style="font-family: Source Sans Pro, sans-serif">which of the following skin regions has been infiltrated by inflammatory cells (lymphocytes)?</span></p>
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<p><span style="font-family: Source Sans Pro, sans-serif">which of the following skin regions has been infiltrated by inflammatory cells (lymphocytes)?</span></p>

which of the following skin regions has been infiltrated by inflammatory cells (lymphocytes)?

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<p>which junctional complex of the epidermis has been impacted?</p>
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<p>which junctional complex of the epidermis has been impacted?</p>

which junctional complex of the epidermis has been impacted?

desmosomes

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<p>what is the pathological condition? on A</p>
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<p>what is the pathological condition? on A</p>

what is the pathological condition? on A

basal cell carcinoma

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<p>what do the numbers represent?</p>
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<p>what do the numbers represent?</p>

what do the numbers represent?

1) Corneum 2) Lucidum 3) Granulosum 4) Spinosum 5) Basale

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<p>where is this tissue located?</p>
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<p>where is this tissue located?</p>

where is this tissue located?

esophagus

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<p>where is this tissue located?</p>
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<p>where is this tissue located?</p>

where is this tissue located?

middle of esophagus. notice presence of skeletal and smooth muscle

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<p>what do the letters represent?</p>
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<p>what do the letters represent?</p>

what do the letters represent?

A: mucosa B: submucosa C: muscularis externa D: adventita/serosa

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<p>what organ is this from? and what are the numbers</p>
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<p>what organ is this from? and what are the numbers</p>

what organ is this from? and what are the numbers

stomach. 1) gastric pit 2) gastric gland star is the muscularis mucosa, 4) submucosa

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<p>what is the pathological condition?</p>
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<p>what is the pathological condition?</p>

what is the pathological condition?

stomach ulcer

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main function of saliva

facilitates swallowing, moisten oral epithelium, neutralize plaque acid, oral immunity

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exocrine glands

transport via ducts

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serous cells

high protein, low carb. stain deeply

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serous cells appearance

triangle profile, eosinophilic secretory granules at apex. basophilic nucleus

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mucous cells

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<p>what type of cells are shown?</p>
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<p>what type of cells are shown?</p>

what type of cells are shown?

mucous cells

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serous cells

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serous cells

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mucous cells

low protein, high carb. greater emphasis on lubrication

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mucous cells appearance

pale and eosinophilic. pyramidal, wide base w/ nucleus

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mucous cells

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endpieces

collection of salivary cells with just the saliva producing cells in aggregates

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acinus

group of serous cells. resembles a raspberry. apical surfaces of cells face lumen. where acinus ends, exocrine ducts begin

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tubules

group of mucous cells

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outer layer of acinus

basal membrane that secludes from surrounding tissues

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serous acini

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mucous tubules

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serous acini

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

mixed mucous and serous

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<p>what are the structures?</p>
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<p>what are the structures?</p>

what are the structures?

lobe and lobule

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the stroma

outer connective tissue capsule (beige). surrounds and penetrates salivary tissues. divides gland into lobes and lobules

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

mucous tubules

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

parotid lobule

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

dense ct parotid capsule

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intralobular

ducts found within lobules, within parenchyma. can be intercalated or striated

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interlobular

leaves parenchyma. excretory duct aka collecting duct

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order of duct movement

intercalated disk → striated duct → excretory duct

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intercalated disk

smaller than acinus/tubule. short cuboidal cells. nuclei fill cells. narrow lumen

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striated duct

tall columnar cells. bands of mitochondria. central nuclei, wide lumen

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

intercalated duct

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

striated duct

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saliva initially _____ to blood plasma, then becomes _______

isotonic, hypertonic

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

excretory ducts

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excretory ducts

within CT, outside of lobes. distinct columnar epithelium. sometimes stratified, sometimes pseudostratified

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

parotid gland

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parotid gland

almost completely serous

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submandibular gland

serous and mucous cells. telltale indicator is demilunes which are serous crescent moons adjacent to mucous tubules

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

demilune of submandibular gland

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

mucous tubule

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

mucous tubules with serous demilunes

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

mucous tubules with serous demilunes

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

mucous tubules with serous demilunes

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<p>what type of gland?</p>
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<p>what type of gland?</p>

what type of gland?

sublingual gland

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sublingual gland

exclusively mucous cells

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myoepithelial cells

surround acini and intercalated disk. stellate cells w processes. flat nuclei, stained brown. provides contractile support and innervated by sympathetic and parasympathetic

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

myoepithelial cells

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

elongated nucleus of myoepithelial cells

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

myoepithelial cell on a mucous tubule

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

myoepithelial cells

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<p>what is the gland?</p>
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<p>what is the gland?</p>

what is the gland?

parotid gland

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<p>what type of duct?</p>
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<p>what type of duct?</p>

what type of duct?

striated duct

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<p>what is the structure?</p>
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<p>what is the structure?</p>

what is the structure?

striated to the left, intercalated duct on the right

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<p>identify the duct</p>
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<p>identify the duct</p>

identify the duct

excretory duct

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<p>what ducts are pictured?</p>
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<p>what ducts are pictured?</p>

what ducts are pictured?

intercalated ducts

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what is the hardest substance in the body?

teeth

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enamel rods

extend from DEJ to outer surface of crown. diameter inc towards outer surface

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what is bw rods?

interrod enamel

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dentin

rigid (harder than bone and cementum), elastic (softer than enamel). 70% hydroxyapatite, 20% collagen, 10% water. protects the whole tooth structure unlike enamel. can regenerate

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tubules

pulpal surface to dentinoenamel and DEJ. contain processes of odontoblasts and dentinal fluid. sigmoid course, aka primary curve

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primary dentin

first to form. 2 subdivisions

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mantle dentin

outermost later of primary. at DEJ. larger diameter collagen fibrils here

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secondary dentin

borders pulp. bulk of primary dentin. more mineralized than mantle. s curve found here

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predentin

innermost layer. non mineralized. adjacent to odontoblasts

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tertiary dentin

reparative response to damage (cavities, restorative procedures). more rapid=more irregular

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pulp

specialized connective tissue. predominantly fibroblasts (GAGs, collagen fibers). support matrix for neurovasculature

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cell free zone nerves

nerves, capillaries

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cell rich zone

fibroblasts, leucocytes

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parietal layer

nervous plexus. unmyelinated axons may terminate among odontoblasts or continue into tubules

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where is there a pathway for infection?

root canals- connect pulp chamber with periodontal tissues

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cementum

thin layer of calcified tissue lining root. seals surface of root dentin and open dentin tubules. softer than dentin. large collagen content

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