Oral Cavity Flashcards
4 Layers of GIT
Mucosa
Submucosa
Muscularis
Adventitia
Mucosae Components
Epith.
LP
Muscularis mucosa
Submucosa components
Depends on the location
- dense CT and gland
- N. plexus=submucosa plexus
Muscularis circular layer components
Sk. and sm. muscle
2-3 layers
longitudinal or circular in muscular layer
Longitudinal
Serosa or adventia in the GIT layer
depends on location
oral cavity anatonmy
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
Vestibule components
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
Oral mucosa skin type
st. sq. non-keratinized epith.
Define vermillion zone
Transition keratine to non-keratine
incre. of red b/c BV w/ incre of deep projection
Oral cavity proper-tongue structure
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)
Oral cavity proper-tongue function
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
Papilla
Mucosa projections on tongue
types of papilla
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
Taste buds
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.
Van ebners gland
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
Teeth define
initial physical food brk dwn
2 major components of teeth
Enamel and dentin
Enamel
Made up hydroxyapatitie (~Ca2+ crystal in bone)
Produce fluorapatite (incre. acid R)
Lays over dentin
Dentin
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
Where does the teeth sit in
alveolar bone
Gingiva
Para/keratinzed St. sq. epith. to R abrasion while ating
Circular/dentogengival fibers=strong attach to alveolar bone
Away=standard oral mucosal
The stages of tooth develop
Bud stage Cap Stage Bell stage Appostion Beginning of eruption Eruption into oral cavity
Bud stage
B4 stg.=embryonic formation of dental lamina
A layer of laminal form epith.
-pushed into tissue from neural crest
Cap stg.
Tooth bud from enamel organs
-surround papilla dental papilla
Bell st.
Form 4th layer
Odontoblast form w/in dental blast as amenoblast layer form for enamel
bone crypt form (alveolar bone)
Appostion stg.
Enamel and dentin produce
Crown forms
Beginning of eruption
Root formation
Myofibroblast in periodonto ligament pull too into postion @ surface
Eruption into oral cavity
After eruption not ameloblast on surface just enamel
Hard palate
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
Soft palate
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
Salivary gland-purpose
Ducts enter oral cavity proper (major salv. gland)
Lesser gland assoc. w/ oral mucosa
Salivary gland-locations
minor and major
Minor salivory gland
through oral cavity (van almor gland)
Major salivary gland
Parotid
Sublingual
Submandib.
Parotid
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
Sublingual
Mouth floor
Duct open into submandibular duct and direct in mouth
Predom. seous w/ som mucous
Submandib.
Mouth floor
Close to mandible
Predom. mucous w/ some sereous
Types of mixed acinus
submandib./lingual
Comp.
-moucus/serous cells
intercalated ducts
salivary gland duct
intercalated duct=low cubodial epith. Stratied duct/intrelob. =columnar Excretory duct/interlob. -Pst.-->st. cubdoal -lrger
Function of salivatory gland
saliva
Saliva function
Lubercation/moisten oral mucosal/food easily swallow
protection against bact.
digestion
Saliva comp.
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.
