Oral Mucous Membrane- Preclinic Theory

Define oral mucous membrane.

the lining of a body cavity that opens up to the outside of the body.

What are the functions of the oral cavity?

1. place of mastication

2. contains the taste organs (taste buds)

3. aids in digestion

4. facilitates swallowing

What is the criteria that dictates structure?

1. function of the area

2. forces that it must withstand

What is the first layer of the mucous membrane?

epithelial layer (stratified squamous)

What is the first layer of the epithelial?

basal cell layer (stratum basale)

what are the characteristics of the basal cell layer?

-cuboid

-cell division takes place

-cells are pushed up to keratinized layer

what is the second layer of the epithelial?

prickle cell layer (stratum spinosum)

what are the characteristics of the prickle cell layer?

-irregular

-polyhedral

-2 sharp edges touch --> intercellular

what is the third layer of the epithelial layer?

granular cell layer (stratum granulosum)

what are the characteristics of the granular cell layer?

-flattened out

what is the fourth layer of the epithelial?

keratinous layer (stratum corneum)

what are the characteristics of the keratinous layer?

-not all is keratinized

-protein that protects the body's tissues

-very flat

_________________ ________________ separates epithelium and connective tissue.

basement membrane

what is the second layer of the mucous membrane?

connective tissue layer (lamina propria)

what is the first layer of connective tissue?

papillary layer

what is the second layer of connective tissue?

reticular layer

what are the characteristics of the reticular layer?

-advantages of interdigitation

-increases the area of contact

-tissue stability

-greater fluid exchange

-allows epithelium layer to get nourishment from the connective tissue

what is the third layer of connective tissue?

submucosa

what are the characteristics of the submucosa?

-attach mucous membrane to underlying layers

-blood, nerves, adipose tissue

what is the fourth layer of connective tissue?

periosteum

what are the characteristics of the periosteum?

-tough CT membrane which covers the outside surface of bone

-bone/skeletal layer underneath

what is the location of the masticatory mucosa?

1. gingiva

2. hard palate

what are the characteristics of the masticatory mucosa?

-epithelium = thick, keratinized

-CT = thick, dense, firm

-Attachment to bone = firmly attached

does the gingiva contain submucosa?

NO

does the hard palate contain submucosa?

YES

what is the location of the lining mucosa?

1. inside lips and cheeks

2. floor of mouth

3. ventral of tongue

4. soft palate

5. alveolar mucosa

what are the characteristics of lining mucosa?

-epithelium = thin, NON-keratinized

-CT = thin

-attachment to bone = loosely attached

where is the specialized mucosa located?

dorsum of the tongue

what are the types of specialized mucosa?

-filiform papillae

-fungiform papillae

-foliate papillae

-circumvallate papillae

what are the characteristics of filiform papillae?

-anterior 2/3 of tongue

-small bumps on tongue

-most numerous

-DO NOT contain taste buds

what are the characteristics of fungiform papillae?

-scattered between filiform

-larger and mushroom shaped

-not as numerous

-thin causes red appearance

-CONTAIN taste buds

what are the characteristics of foliate papillae?

-posterior borders of the tongue

-CONTAIN taste buds

what are the characteristics of circumvallate papillae?

-anterior to foramen cecum

-V-shaped

-truncated cone

-saliva collects in troughs that aid in digestion

-CONTAIN taste buds

where are taste buds located?

1. fungiform papillae

2. foliate papillae

3. circumvallate papillae

what is the sweet sensation?

perceived on the tip of the tongue by fungiform papillae (licking ice cream cone)

what is the salty sensation?

perceived on the sides of the dorsal surface by the fungiform papillae

what is the sour sensation?

perceived on the lateral borders of the tongue by the foliate papillae

what is the bitter sensation?

perceived in the middle of the tongue by the circumvallate papillae