Oral Cavity

Question 1

4 Layers of GIT

Answer 1

Mucosa
Submucosa
Muscularis
Adventitia

Question 2

Mucosae Components

Answer 2

Epith.
LP
Muscularis mucosa

Question 3

Submucosa components

Answer 3

Depends on the location

• dense CT and gland
• N. plexus=submucosa plexus

Question 4

Muscularis circular layer components

Answer 4

Sk. and sm. muscle

2-3 layers

Question 5

longitudinal or circular in muscular layer

Answer 5

Longitudinal

Question 6

Serosa or adventia in the GIT layer

Answer 6

depends on location

Question 7

oral cavity anatonmy

Answer 7

Vestibule 
-space b/w lips/cheeks and teeth
Oral Cavity proper 
-b/w teeth and pharynx (back of throat)
-hard/soft palate (sup.)
-Tongue and mouth floor(inf.) 
Salivary glands
-ducts enter the oral cavity proper 
  :major salv. glands
-lesser glands assoc. w/ oral mucosa

Question 8

Vestibule components

Answer 8

Lips 
-integument
-oral mucosa=inner aspect 
  :special epith (epith./LP)
-vermillion zone=b/w in/outer
-sk. muscle=core 
Rest of vestibule lined w/ oral mucosa w/ minor salivary gland

Question 9

Oral mucosa skin type

Answer 9

st. sq. non-keratinized epith.

Question 10

Define vermillion zone

Answer 10

Transition keratine to non-keratine

incre. of red b/c BV w/ incre of deep projection

Question 11

Oral cavity proper-tongue structure

Answer 11

Oral mucosa forms papilla
Core=sk. muscle
-muscle oriented in 3 directions
-allow tongue to move in multiple planes (only few places this cn occur)

Question 12

Oral cavity proper-tongue function

Answer 12

Taste=taste buds on papilla
Move food in oral cavity to teeth promoting physical brk dwn
Swallowing assistance=move food wn
Human=speech vs. other animals=grooming

Question 13

Papilla

Answer 13

Mucosa projections on tongue

Question 14

types of papilla

Answer 14

Filiform=no taste buds and thin
-para/keratin 
Fungiform=few taste bud (@ tips)
-mushrrom like shape
-taste buds not always hito. seen
-st. sq. epith. 
-parakeratin b/w filiform 
-might not see taste buds @ tip
-CT @ surface of pilia broader 
Foliate(ridges)=lateral taste buds
-MC on rats and not as much in adults 
-Ridges=sq/rectangle space 
-minor salivory gland=serous gland 
-found surrounding circumvallate (ducts lean into clefts)
Circumvallate=lateral taste buds
-common in shape in all mamals
-allow to wash food away to form new room for taste

Question 15

Taste buds

Answer 15

W/in epith. w/ parakeratin overlays 
contain thin N. CT capsule 
Structures
-Taste pore
-microvilli (projection recpt. for chem. in food)
-supporting cells 
-sensory cells
-basal cells 
-N.

Question 16

Van ebners gland

Answer 16

AKA lingual salivory gland (minor glands)
Serous gland releasing products into clefts of papilla
~Function as bowmans gland (olfactory gland)
Wash dwn food to taste new things

Question 17

Teeth define

Answer 17

initial physical food brk dwn

Question 18

2 major components of teeth

Answer 18

Enamel and dentin

Question 19

Enamel

Answer 19

Made up hydroxyapatitie (~Ca2+ crystal in bone)
Produce fluorapatite (incre. acid R)
Lays over dentin

Question 20

Dentin

Answer 20

Under neath enamel w/ lower conc. 
Incre. Ca2+ than bone 
Attached to periodonto memb./cemento enamel jucntion/epith. 
Dentin pulp 
-contains BV, N, and CT
Odontoblast=maintain dentin

Question 21

Where does the teeth sit in

Answer 21

alveolar bone

Question 22

Gingiva

Answer 22

Para/keratinzed St. sq. epith. to R abrasion while ating
Circular/dentogengival fibers=strong attach to alveolar bone
Away=standard oral mucosal

Question 23

The stages of tooth develop

Answer 23

Bud stage
Cap Stage
Bell stage
Appostion
Beginning of eruption 
Eruption into oral cavity

Question 24

Bud stage

Answer 24

B4 stg.=embryonic formation of dental lamina
A layer of laminal form epith.
-pushed into tissue from neural crest

Question 25

Cap stg.

Answer 25

Tooth bud from enamel organs | -surround papilla dental papilla

Question 26

Bell st.

Answer 26

Form 4th layer Odontoblast form w/in dental blast as amenoblast layer form for enamel bone crypt form (alveolar bone)

Question 27

Appostion stg.

Answer 27

Enamel and dentin produce | Crown forms

Question 28

Beginning of eruption

Answer 28

Root formation | Myofibroblast in periodonto ligament pull too into postion @ surface

Question 29

Eruption into oral cavity

Answer 29

After eruption not ameloblast on surface just enamel

Question 30

Hard palate

Answer 30

``` Keratinzed St. sq. epith. to R abrassion Bone -Raphe=middle projection Thin layer of CT to cover bone no glands/muscle Purpose=support/food movement ```

Question 31

Soft palate

Answer 31

Parakeratinzed st. sq. epith. No bone Thick layer of CT w/ adipose (allows for soft) Muscosal gland s/ sk. muscle Purpose=swallwoing aid -sk. muscle contract sallowing food to go to oral -->esophagus

Question 32

Salivary gland-purpose

Answer 32

Ducts enter oral cavity proper (major salv. gland) | Lesser gland assoc. w/ oral mucosa

Question 33

Salivary gland-locations

Answer 33

minor and major

Question 34

Minor salivory gland

Answer 34

through oral cavity (van almor gland)

Question 35

Major salivary gland

Answer 35

Parotid Sublingual Submandib.

Question 36

Parotid

Answer 36

Define: secrotory gland is below/front of ear and duct open by 2n molar inoral -sup. jaw All sereous w protein secretion See zymogen granules in cells

Question 37

Sublingual

Answer 37

Mouth floor Duct open into submandibular duct and direct in mouth Predom. seous w/ som mucous

Question 38

Submandib.

Answer 38

Mouth floor Close to mandible Predom. mucous w/ some sereous

Question 39

Types of mixed acinus

Answer 39

submandib./lingual Comp. -moucus/serous cells intercalated ducts

Question 40

salivary gland duct

Answer 40

``` intercalated duct=low cubodial epith. Stratied duct/intrelob. =columnar Excretory duct/interlob. -Pst.-->st. cubdoal -lrger ```

Question 41

Function of salivatory gland

Answer 41

saliva

Question 42

Saliva function

Answer 42

Lubercation/moisten oral mucosal/food easily swallow protection against bact. digestion

Question 43

Saliva comp.

Answer 43

Prot. -alpha amylase=brk dwn carb for digestion -lyzozome=attack bact. Glycop. -mucin=lubercation -cong. antiBD=produced by plasma cell b/w acin Ion/h2o=include bicarb. ion to buffer oral cavity IgA=polymerized -attack bact.