Oral cavity histology

Question 1

Oral mucosa

Answer 1

Strat squamous, non cornified (keratinized) epi
+ underlying CT

however some areas with high abrasive forces there is parakeratinization ( lips, gingiva, hard palate)

Question 2

Major Salivary glands

Answer 2

parotid (serous), submandibular(mixed), sublingual (mucous)

have ducts into the oral cavity, deliver saliva to oral mucosa

Question 3

Parotid Gland

Answer 3

largest, serous
compound tubulo-acinar
**salivary amylase
contain adipose cells

Question 4

submandibular gland

Answer 4

accounts for 70% of salivary volume-with sublingual
mixed serous/mucous
*salivary amylase and mucins (lube up food bolus)

Question 5

Sublingual

Answer 5

mostly mucous, with small amt of serous

same products as submandibular gland

Question 6

Vermillion zone

Answer 6

of lips, pink region
extensive dermal papillae —>inc SA—>locks epi to BM
highly vascular: capillary loops—>deep color

Question 7

Adult teeth

Answer 7

32 permanent
20 succedanous
12 molars

Question 8

ameloblasts

Answer 8

produce enamel similar to osteoblasts
present in the “unerupted tooth”

as soon as tooth begins to project into the oral cavity you no longer have ameloblasts

enamel is the hardest substance

Question 9

Odontoblasts

Answer 9

lay down dentin
reside w/in the pulp chamber
therefore they can continue to produce dentin (not as hard)

Question 10

periodontal ligament

Answer 10

attaches cementum of tooth to the alveolus

prevents loss of tooth from socket

Question 11

gingiva

Answer 11

stratified squamous parakeratinized-esp near the tooth boarder

curves in and grows down along enameled surface where it it connected by hemidesmosomes

Question 12

Hard palate

Answer 12

ant 3/4, bony
overlain by SS parakeratinized epi with dense irregular CT
anterior there are adipose cells
posterior there are minor mucus glands (continuous with soft palate)

Question 13

Uvula

Answer 13

posterior most extension of the soft palate
SS non-cornified
serous and seromucous glands
functions in speech
protects ascending airway during swallowing

Question 14

Tongue muscles

Answer 14

Intrinsic muscle: composed of intertwined skeletal muscle

• sup longitudinal
• inf longitudinal
• vertical (run in sup/inf axis)
• transverse (run in transverse axis)

Question 15

Glands of nuhn

Answer 15

in tongue
produce mucus
help form food bolus

Question 16

glands of Von Ebner

Answer 16

tongue serous glands

drain into clefts of tongue

Question 17

sulcus terminalis

Answer 17

deepend fold that demarcates the ant and post tongue
contains the foramen cecum (embryologically becomes thyroid)
dorsal/lateral papillae

Question 18

Filiform papillae

Answer 18

numerous, slender
—>velvety appearance to tongue
SS cornified
scrape food from surface, no taste buds

Question 19

fungiform papillae

Answer 19

resemble mushroom
SS non-cornified
contain subepithelial capillaries—>red dots

have taste buds on their dorsal aspect

Question 20

circumvallate papillae

Answer 20

8-12 V shaped anterior to sulcus terminalis
surrounded by von ebner, empty into surrounding valleys to wash them out
taste buds on side

Question 21

foliate papillae

Answer 21

posterolateral
vertical furrows
mostly only as neonates (taste buds degenerate)

Question 22

Taste buds

Answer 22

neuroepithelial (gustatory) cell with apical pore
have microvilli which absorb and transduce taste sensation
every bud can detect any/all types of tastes, however generally they specialize to one type (either ionotropic or metabotropic)

Question 23

Ion channel taste mediators

Answer 23

salty and sour

Question 24

membrane receptor taste mediators

Answer 24

sweet
bitter
savory