REVISION GUIDE: GI MOUTH Flashcards Preview

PHASE 1 REVISION GUIDE > REVISION GUIDE: GI MOUTH > Flashcards

Flashcards in REVISION GUIDE: GI MOUTH Deck (63)
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1

what are the defences of the oral cavity?

- mucosa - physical barrier
- salivary glands
- palatine tonsils - surveillance system

2

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

3

what is the function of the mouth?

it is responsible for chewing, savouring and swallowing ingested food
forms a bolus

4

what are the bones of the mouth?

maxilla
mandible

5

how many teeth do children and adults have?

20
32 - 16 maxillary and 16 mandibular

6

what are the different types of teeth and how amny are there?

per quadrant
- 2 incisors
- 1 canine
- 2 premolars
- 3 molars

7

what is the role of the tongue?

it is responsible for gustation (sense of taste)

8

what are the 5 tastes?

sweet, sour, salty, bitter and umami

9

what are the different types of taste buds?

filiform
fungiform
circumvallate

10

where are filiform cells found and how many taste cells are there?

they are anterior
no taste perception

11

where are fungiform cells found and how many taste cells are there?

found anterior and lateral
10 taste cells

12

where are circumvallate cells found and how many taste cells are there?

they are large
100 taste cells

13

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

14

what is the flow rate and daily secretion of saliva?

flow rate = 0.3-7ml per min
daily secretion = 800-1500ml

15

what is the effect of salivary gland dysfunction?

oral pain
infections
risk of cavities

16

what are the different types of salivary secretion?

serous
mucous

17

what does serous salivary secretion contain?

alpha amylase for starch

18

what does mucus salivary secretion contain?

mucins for lubrication of mucosal surfaces

19

what type of secretion occurs at the parotid gland?

serous

20

what type of secretion occurs at the submandibular glands?

mucous

21

what type of secretion occurs at the sublingual glands?

mucous and serous (mainly mucous)

22

what type of secretions occur at the minor glands of the mouth?

mainly mucous but some are serous

23

what factors affect the composition and amount of saliva produced?

flow rate
circadian rhythm
type and size of gland
duration and type of stimulus
diet

24

what are intercalated ducts of salivary glands?

they are short, narrow segments with cuboidal cells that connect acini to larger striated ducts

25

what are striated ducts of salivary glands?

it is striated
it is the major site for reabsorption of NaCl

26

what ions do salivary ducts secrete?

K+ and HCO3-

27

what ions do salivary ducts reabsorb?

Na+ and Cl-

28

what is the structure of ducts?

there are intralobular ducts and main excretory ducts
the intralobular ducts can be divided into intercalated and striated

29

what is primary saliva?

NaCl rich isotonic plasma like fluid secreted by acini

30

what is the effect of parasympathetic stimulation on salivary glands?

causes production of a copious flow of saliva