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