Digestive System - Oral Cavity Flashcards Preview

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Flashcards in Digestive System - Oral Cavity Deck (52):
1

what are the 4 layers of the digestive tract?

Mucosa
Submucosa
Muscularis
Serosa

2

what are 4 important functions of the alimentary mucosa?

barrier
immunological function
absorption
secretion

3

where is the vestibule in the oral cavity?

space b/w the lips, cheeks and teeth

4

where is the oral cavity proper in the oral cavity?

space behind the teeth

5

which glands have a capsule?

major

6

what are the major salivary glands?

Parotid gland
Submandibular gland
Sublingual gland

7

What are the minor salivary glands?

Buccal
Labial
Lingual
Molar
Palantine

8

what are found surrounding the acini of the minor glands?

plasma cells and lymphocytes

9

what are the 4 parts of the salivon?

acinus
intercalated duct
striated duct
excretory duct

10

what are the 3 types of acini?

serous
mucous
mixed

11

what part of the salivon is well developed in serous glands?

intercalated ducts
striated ducts

12

what part of the salivon is NOT well developed in mucous glands?

intercalated ducts

13

what is the large duct of the parotid gland that enters the oral cavity?

Stensen's duct

14

secretory units of the parotid duct are completely _____ and surround numerous, long _____

serous; intercalated ducts

15

what is mumps?

a viral infection of the parotid gland that could damage the facial nerve

16

what is the main duct in the submandibular gland?

Wharton's duct

17

what kind of the gland is the submandibular gland?

predominately serous

18

what kind of gland is the sublingual gland?

predominately mucous gland

19

what are the 5 main functions of saliva?

controls bacteria
digests carbs
moistens food and oral cavity
stimulates taste buds
buffers

20

what enzyme lyses bacteria in saliva?

lysozyme

21

what bacteria digests carbs in saliva?

Alpha- amylase

22

what immunoglobulin is found in saliva?

IgA

23

What are myoepthelial cells?

contractile cells that move secretory products toward the excretory duct

24

what two rings are tonsils organized into?

tonsillar ring
Waldeyer's lymphatic ring

25

where is the masticatory mucosa?

in the hard palate + gums

26

what are the 2 types of epithelium in the masticatory mucosa?

keratinzed stratified squamous epithelium
parakeratinized epithelium

27

what is parakeratinized epithelium?

similar to keratinized but the superficial cells do not loose their nuclei

28

what does the keratinized epithelium in the masticatory mucosa lack?

stratum lucidum

29

what type of epithelium is the lining mucosa?

generally nonkeratinized but may be parakeratinized

30

what are the 3 layers in the nonkeratinized epithelium?

stratum basale
stratum spinosum
stratum superficiale

31

melanocytes are derived from what origin?

Neural crest cells

32

what are merkel cells?

modified epidermal cells in the stratum basale

33

how do the muscle fibers of the tongue run?

in three planes perpendicular to one another

34

what are the smooth dark bulges on the posterior side of the dorsal tongue?

lingual tonsils in the lamina propia

35

what divides the tongue into anterior 2/3 and posterior 1/3?

terminal sulcus

36

what is the apex of the terminal sulcus?

foramen cecum

37

what are the papillae that are only really found in bunnies?

foliate papillae

38

which papillae look like mushrooms?

fungiform papillae

39

which papillae look like a large dome and have a moat around them?

circumvallate papillae

40

which papillae are the smallest and most numerous?

filiform papillae

41

what is the small opening at the apex of the taste bud?

taste pore

42

what are the 3 cell types in taste buds?

neuroepithelial cells
basal cells
supporting cells

43

what are neuroepithelial cells in taste buds?

cells from the basal lamina to the taste pore w/ microvilli that synapse w/ CN 7, 9, and 10

44

what origin is enamel?

ectodermal

45

what origin are most structures of the teeth?

mesoderm/ neural crest cells

46

what are the 3 specialized layers of teeth?

enamel
dentin
cementum

47

what secretes dentin?

odontoblasts

48

what is cemtum?

thin, pale, yellowish layer of calcified AVASCULAR tissue covering teh dentin of the root of tooth

49

what secretes cementum?

cementocytes

50

what is the only sensory modality recognized by teeth?

pain (nerve fibers are unmyelinated)

51

where do nerve fibers and blood vessels enter teeth?

apical foramen

52

what is the gomphosis of the tooth?

the tooth, socket, and periodontal ligament (peg in socket joint)