Lecture 5 The tongue/oral mucosa

Sem 1 histology

What are the 3 types of mucosa in the mouth

lining masticatory specialized

What structures does the basement membrane lie between and what is it made of

epithelium and lamina propria, ECM

is lining mucosa keratinized and where is it found

floor of the mouth, buccal labial alveolar ventral tongue soft palate, non ker.

What does the dermis encompass

lamina propria

What is the cell structure and arrangement of lining mucosa?

non k strat squam epi

What kind of fiber does lining mucosa contain?

elastic

Where is the submucosa located and what is its function?

under the lamina propria and it helps with cusioning, supplys nerves, blood vessels, glands, lymph for the mucosa

what are the 3 dermis layers of the oral mucosa and what do they mean?

epidermis-top layer, dermis-skin, hypodermis-bottom layer

does lining mucosa have less pronounced/fewer rete ridges/connective tissue papillae

yes

what is the difference between lining mucosa and epithelium?

lining mucosa-epithelium+lamina propria+submucosa

Epithelium-just the top cellular layer

what does the submucosa on the floor of the mouth include?

submandibular/subling glands

is the mucosa of the floor of the mouth attached to bone and muscles?

yes

what kind of tissue and glands does the submucosa of the cheeks contain?

adipose and minor salivary

What kind of fibers are found abundant in alveolar mucosa

elastic

what kind of glands does the lamina propria contain in the mucosa of the lips and what kind of secretion

minor secromucous salivary gland

where is the junction of the vermillion border

between skin of face and oral mucosa

what is Eleidin and what is its purpose

clear intracellular protein, helps blood vessels show-lip color

what are the layers of lining mucosa in the epidermis starting from the top

superficial, intermediate, basal

where is the tubercle of upper lip and labial commissure

midline projection of tissue center of vermillion border, corner of lips

what is in the papillary layer and where is it found

contains CT papillae, capillaries, nerves. top portion of lamina propria, under the epithelium

Why are the retes ridges less pronounced on lining mucosa?

gives flexibility and movement. Pronounced retes ridges+ridid, immovable bc more interdigitation

what does the submucosa of the soft palate contain?

muscles of soft palate and mucous glands (minor glands)

Is masticatory mucosa keratinized? and what is the arrangement/shape cell type?

parakeratinized and orthokeratinized strat squam

where in the mouth is masticatory mucosa found?

hard palate, attached gingiva, dorsal surface of tongue

are the retes ridges pronounced on masticatory mucosa?

yes

what does the submusoca in the masticatory mucosa contain?

it is thin or absent

what is the difference btw orthokeratinized and parakeratinized epi?

ortho-no nuclei-dead. Para-partially keratinized, some nuclei

what are the borders of the gingiva

edge of free gingiva to mucogingival junction

where is the outer and inner margin of the free gingiva

gingival sulcus and oral cavity

is alveolar mucosa keratinized?

no

can non K tissue be Keratinized?

yes

what is hyper keratinization due to and give some examples

chronic tissue trauma, linea alba, nicotine stomatitis, frictional keratosis, gingival fibrosis

is the tongue an organ?

yes

what kind of muscle is the anterior 2/3 of the tongue composed of?

skeletal

what bone is the posterior 1/3 of the tongue anchored to?

hyoid bone

define ankyloglossia

short lingual frenum /tongue tie

which area of the tongue contains specialized mucosa?

anterior 2/3

what is the difference btw papillae and taste buds?

papillae-shape/structure, taste buds-sensory organ that is inside some papillae

where are taste buds located?

tongue, soft palate, back of throat

what are the 4 types of papillae?

fungiform filiform circumvallate foliate

what is the shape of filiform, do they have taste buds and is the epi keratinized

fine pointed cones, no, ortho/para k

describe fungiform, what is the function and what kind of keratinized epi does it contain

mushroom shaped red dots that have taste buds, ortho/parakaratinized, to taste.

what is the shape function and keratin type of foliate paillae and where is it found

leaf, taste, para/ortho k, lateral posterior side of tongue

how many papillae, what shape and type of keratinization epi is circumvallate papillae

7-15, mushroom, para/ortho k

what is the name of the salivary gland that is found at the circumvallate papillae?

von ebners

what is the function for circumvallate papillae

taste

how many cells are in one taste bud?

30-80

what are the 4 taste sensations?

bitter sweet sour and salty

explain the taste identifying pathway

food molecule-enters pore-attaches to receptors-carried to sensory neuron process-nerve-carried to CNS-identifies taste

what is the turnover rate for taste buds?

10 days

what does turnover time help to determine

recovery rate

what area in the mouth has the fastest turnover time and how long?

JE-4-6 days

What area in the mouth has the slowest turnover time and how long?

hard palate, 24 days

what are rete ridges

downward projections of the epithelium

list the epidermal layers of ortho/parakeratinized epi

Keratin-granular-prickle-basal

does the lamina propria and submucosa both have connective tissue? what is the difference?

yes, lamina-supports the epithelium physically and nutritionally, Sub-provides thicker structural support physically and nutritionally

list the layers of the oral mucosa in the dermis and hypodermis

papillary layer, fibrous layer, submucosa

what is the dermal layer that the lamina propria is found

dermis

what is the layer on top of the dermis layer?

basement membrane

what are the two layers and two subdivisions of the basement membrane

basal lamina-lamina lucia lamina densa, reticular lamina

what is CT papilla

Upward projections of the CT