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Histology Exam 1
Lecture 6 (Salivary Glands)
29
Other
Not Applicable
06/06/2008

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Term
major salivary glands
Definition
- parotid
- submandibular
- sublingual
Term
parotid
Definition
- largest of 3 salivary glands
- facial nerve runs through
- has connective tissue capsule
- all serous-secreting
- contains Stensen's duct
- 25-45% saliva production
Term
stensen's duct
Definition
- main duct that drains parotid gland
Term
submandibular
Definition
- 2nd largest of salivary glands
- has connective tissue capsule
- contains Wharton's duct
- mixed, but mainly serous-secreting
- 45-65% saliva production
Term
sublingual
Definition
- smallest of salivary glands
- no distinct connective tissue capsule
- no major draining duct
- contains ducts of rivinus and batholin's duct that open onto mouth floor
- mixed, but mainly mucous-secreting
- 5-10% saliva production
Term
Wharton's duct
Definition
- main duct that drains submandibular gland
Term
Minor salivary glands
Definition
- produce very little saliva
- labial
- buccal
- palatine
Term
serous-secreting glands
Definition
- major: parotid
- minor: lingual serous glands of von Ebner
Term
lingual serous glands of von ebner
Definition
- minor serous-secreting salivary gland
Term
mucous-secreting glands
Definition
- minor: minor palatine and minor lingual glands in posterior 1/3 of tongue
Term
mixed secretion glands
Definition
- major: submandibular and sublingual
- minor: minor labial, buccal, and lingual in anterior tongue
Term
salivary glands
Definition
- can be serous-, mucus- or mixed-secretion glands that utilizes merocrine (eccrine) gland secretion
Term
cells in salivary glands
Definition
- serous-secreting, mucous-secreting and myoepithelial cells
Term
serous-secreting cells
Definition
- produce all protein components of saliva
Term
mucous-secreting cells
Definition
- secrete mucins which mix with fluids in oral cavity to produce mucus
- contributes to viscosity of saliva
Term
myoepithelial cells
Definition
- contractile cells that surround secretory cells with extensions of cytoplasm and squeeze secretions into ducts
Term
ducts in salivary glands
Definition
- intercalated
- striated
Term
intercalated vs. striated ducts
Definition
- closest to secretory cell, first passageway for saliva, found in major and minor salivary glands
- transports secretions to larger ducts, modifies saliva
Term
striated duct's role in saliva modification
Definition
- na/cl reabsorbed
- k/hco3 secreted into saliva
Term
composition of saliva influenced by
Definition
- flow rate
- too fast: not enough na/cl removed
- too slow: potassium right saliva formed, leading to dental caries
Term
saliva composition
Definition
- mucous cells
- plasma cells in cytoplasm
- salivary proteins
- high in calcium and phosphate
Term
mucous cells vs. plasma cells vs. salivary proteins
Definition
- MG1 and MG2 mucins
- IgA
- come from serous cells
Term
function of saliva
Definition
- moisten oral mucosa and food
- cools food
- important defense mechanism
- medium for dissolved foods to stimulate taste buds
- buffers oral cavity w/hco3
- controls bacterial flora of oral cavity
- assists in production of acquired enamel pellicle
Term
alpha-amylase
Definition
- breaks down carbs in saliva
Term
lingual lipase
Definition
- breaks down fats in saliva
Term
hyposalivation
Definition
- low amount of saliva
- contributes to dental caries
Term
xerostomia
Definition
- dry mouth resulting from reduced/absent saliva flow
- contributes to dental caries
Term
calcium and phosphate in saliva
Definition
- mineralization of new teeth and repairs precarious lesions
Term
acquired enamel pellicle
Definition
- thin organic film on enamel that protects tooth from oral plaque biofilm
-formed by saliva
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