travers (saliva cont) Flashcards
what are common features of the acing (secretory) part of a salivary gland
cluster of acinar cells surrounding lumen
spaces between the cells/tight junctions allow passage of water and small ions but not larger molecules
myoepithelial cells surround acinus
entire thing surrounded by basal lamina
Anatomical features of serous (acinar) cells
pyramidal shape
lots of RER
rest on basal lamina
short, irregular microvilli
secrete many enzymes and glycoproteins (esp amylase) thru secretory granules in apical cell
Do serous cells secrete mucins
not in appreciable amounts
Anatomical features of mucous cells
cuboidal/columnar
oval nuclei towards base
arranged in tubules around larger central lumen
secrete mucins
secretory granules are pale staining
Which has a larger lumen: serous or mucous
mucous
What is a serous demilune
histological artifact – just a mixed acinus
What is a myoepithelial cell
common to serous and mucous
epithelial cell with contractile properties
From the beginning of a saliva gland, what order are the ducts in
intercalated
striated
excretory
What type of ducts do minor salivary glands have
intercalated (sometimes)
excretory is main type
What type of ducts do minor salivary glands NOT have
striated
What is the smallest type of duct
intercalated
What is the main function of intercalated ducts
to move saliva
secrete a few proteins
What is the main function of striated ducts
reabsorption of sodium and chloride – this is why saliva that reaches the mouth is hypotonic
secrete bicarbonate
REQUIRES ATP
What do striated ducts look like
tall columnar cells that are highly polarized
What is the main function of excretory ducts
just put saliva into oral cavity (no secretion or resorption)
