Flashcards in REVISION GUIDE: GI MOUTH Deck (63)
what are the defences of the oral cavity?
- mucosa - physical barrier
- salivary glands
- palatine tonsils - surveillance system
what is the role of salivary glands in the defence of the oral cavity?
saliva washes away food particles which bacteria and viruses use as metabolic support
salivary glands are surrounded by lymphatic system which contain a range of functional immune cells
what is the function of the mouth?
it is responsible for chewing, savouring and swallowing ingested food
forms a bolus
what are the bones of the mouth?
how many teeth do children and adults have?
32 - 16 maxillary and 16 mandibular
what are the different types of teeth and how amny are there?
- 2 incisors
- 1 canine
- 2 premolars
- 3 molars
what is the role of the tongue?
it is responsible for gustation (sense of taste)
what are the 5 tastes?
sweet, sour, salty, bitter and umami
what are the different types of taste buds?
where are filiform cells found and how many taste cells are there?
they are anterior
no taste perception
where are fungiform cells found and how many taste cells are there?
found anterior and lateral
10 taste cells
where are circumvallate cells found and how many taste cells are there?
they are large
100 taste cells
what are the functions of saliva?
- lubricant for mastication/swallowing/speech
- oral hygiene; wash/immunity/buffer
- maintaining oral pH
- release digestive enzymes eg salivary amylase
- aqueous solvent necessary for taste
what is the flow rate and daily secretion of saliva?
flow rate = 0.3-7ml per min
daily secretion = 800-1500ml
what is the effect of salivary gland dysfunction?
risk of cavities
what are the different types of salivary secretion?
what does serous salivary secretion contain?
alpha amylase for starch
what does mucus salivary secretion contain?
mucins for lubrication of mucosal surfaces
what type of secretion occurs at the parotid gland?
what type of secretion occurs at the submandibular glands?
what type of secretion occurs at the sublingual glands?
mucous and serous (mainly mucous)
what type of secretions occur at the minor glands of the mouth?
mainly mucous but some are serous
what factors affect the composition and amount of saliva produced?
type and size of gland
duration and type of stimulus
what are intercalated ducts of salivary glands?
they are short, narrow segments with cuboidal cells that connect acini to larger striated ducts
what are striated ducts of salivary glands?
it is striated
it is the major site for reabsorption of NaCl
what ions do salivary ducts secrete?
K+ and HCO3-
what ions do salivary ducts reabsorb?
Na+ and Cl-
what is the structure of ducts?
there are intralobular ducts and main excretory ducts
the intralobular ducts can be divided into intercalated and striated
what is primary saliva?
NaCl rich isotonic plasma like fluid secreted by acini