Oral Mucosa 2

Question 1

What branchial arch does the mucosa of the body of the tongue derive from?

Answer 1

BA 1

Question 2

T/F: Tongue root mucosa is derived from BA 2

Answer 2

False- This mucosa is from BA 3

Question 3

What lies beneath the lamina propria of the tongue?

Answer 3

Muscle. There is no submucosa present.

Question 4

What cranial nerves convey taste?

Answer 4

CN VII, IX, X

Question 5

Which CN provides somatosensory innervation to the anterior mouth?

Answer 5

CN V

Question 6

Which CN provides somatosensory innervation to the posterior tongue/pharynx?

Answer 6

CN IX

Question 7

What do A-beta fibers convey?

Answer 7

Touch

Question 8

Pain is conveyed through A-delta and C fibers. T or F?

Answer 8

True

Question 9

Which fiber responds to both painful and innocuous cooling?

Answer 9

C fiber

Question 10

Which fiber responds to both painful and innocuous warmth?

Answer 10

A-delta fiber

Question 11

What mechanoreceptor terminates b/t rete pegs (never enters the epithelium), and senses dynamic, rapidly adapting forces?

Answer 11

Meissner’s Corpuscles

Question 12

Where do Merkel receptors terminate?

Answer 12

At the apices of rete pegs

Question 13

What type of force do Merkel receptors detect?

Answer 13

Static forces

Question 14

T/F: Free nerve endings always terminate in the lamina propria.

Answer 14

False- They can either terminate in the lamina propria or the epithelium

Question 15

Do Merkel and Meisner receptors code for pain if the stimulus reaches noxious levels?

Answer 15

No, only mechanoreception. Free nerve endings carried by A-delta and C fibers deal with pain.

Question 16

What are the 5 types of taste and an example of each?

Answer 16

Sweet-Sugars
Umami-Amino Acids
Salty-Sodium
Sour-Acids
Bitter-Coffee, Beer, (Notes say alkaloid, purine base, glycosides)

Question 17

How is a taste bud oriented in regards to the basal lamina?

Answer 17

Right angle

Question 18

What is the shape of a taste bud?

Answer 18

Goblet-shaped

Question 19

T/F: All cells of the taste bud possess microvilli.

Answer 19

False-Only the Elongated cells possess them. (I looked up if all 3 types of elongated cells have microvilli and came to the conclusion that only Type I and II have them.–Google Books, “Taste and Smell: An Update”)

Question 20

About how many taste buds are on the oral mucosa?

Answer 20

8,000

Question 21

What are the percentages for taste buds for tongue, pharynx/larynx, and soft palate?

Answer 21

Tongue-68%
Pharynx/Larynx-27%
Soft Palate-5%

Question 22

T/F: Circumvallate Papillae are located on the posterior 1/3 of tongue

Answer 22

False: They are located on the most posterior portion of the anterior 2/3 of the tongue

Question 23

Where are fungiform papillae located?

Answer 23

Anterior 2/3 of dorsum of tongue

Question 24

Location of foliate papillae?

Answer 24

Lateral portion of tongue at most posterior portion of the anterior 2/3.

Question 25

What papillae does the chorda tympani branch of CN VII (BA 2) innervate?

Answer 25

Fungiform Papillae

Question 26

Taste buds are located on what surface of fungiform papillae?

Answer 26

Dorsal

Question 27

About how many taste buds are on 1 fungiform papillae?

Answer 27

average of 3

Question 28

On average, how many taste buds do filiform papillae contain?

Answer 28

0-no buds here

Question 29

What type of fibers innervate filiform papillae?

Answer 29

Only Somatosensory-Merkel&Meisners (A-beta), free nerve endings (C, A-delta)

Question 30

What CN innervates foliate papillae?

Answer 30

CN IX (BA 3)

Question 31

What is location of taste buds on foliate papillae?

Answer 31

In trenches on sides, not on top like the fungiform papillae

Question 32

Which papillae are most closely associated with Von Ebner's glands?

Answer 32

Foliate and Circumvallate

Question 33

Where are circumvallate taste buds located?

Answer 33

In trenches on sides

Question 34

What is the location of taste buds that mainly respond to deviations from isotonicity?

Answer 34

Larynx

Question 35

What was main point of study regarding responses of individual fungiform papillae and taste?

Answer 35

Pretty much 1 fungiform can discriminate b/t multiple tastes.

Question 36

Are taste stimuli undetectible on the front side of the tongue contralateral or ipsilateral to chorda tympani anesthesia?

Answer 36

Ipsilateral

Question 37

Does chorda tympani nerve anesthesia effect "whole mouth" taste perception?

Answer 37

Very minimally b/c of the functional redundancy of the taste system makes it resilient to partial taste loss

Question 38

According to study: Do all individuals have about the same number of fungiform papillae?

Answer 38

No, the number varies greatly person to person

Question 39

Do all people have the same ability to taste different molecules? What about PTC?

Answer 39

Everyone has a different affinity to taste specific molecules. The ability to taste PTC is an inherited trait.

Question 40

Name a specific bitter receptor.

Answer 40

Tas2r

Question 41

What did she "impress" upon us in regards to the vegetable bitterness and intake studies?

Answer 41

Certain vegetables taste more bitter to those who are homozygous for the PTC-senstive form of tas2r38 and vice versa. This varying sensitivity has been shown to impact the intake of certain vegetables based upon bitterness

Question 42

Where are perigemmal cells located on the taste bud?

Answer 42

Lateral aspect

Question 43

What is the main function of basal cells of taste bud?

Answer 43

Renewal-very high turnover

Question 44

Are type I elongated cells dark or light in EM views?

Answer 44

Dark

Question 45

Which type of elongated cell has a suggested supportive role?

Answer 45

Type 1 Dark-stains for glial markers, supportive role.

Question 46

T/F: Type 1 Dark cells have microvilli and synapse with a primary afferent nerve

Answer 46

False-They do have microvilli but do not synapse

Question 47

Which elongated cells express receptors for taste and respond to taste stimuli?

Answer 47

Type II and Type III Light

Question 48

Which taste(s) corresponds to Type II Light cells?

Answer 48

Bitter, Sweet, Umami

Question 49

Which taste(s) corresponds to Type III Light cells?

Answer 49

Sour

Question 50

T/F: Type III Light cells synapse with primary afferent nerve

Answer 50

True. Type II Light do NOT synapse with primary afferent

Question 51

What is used as a non-synaptic taste transmitter for Type II cells? (Also Type III can do this as well)?

Answer 51

ATP

Question 52

What intermediate filament protein is thought to reflect rapid turnover of taste receptor cells?

Answer 52

Keratin-19 (K19)

Question 53

What appears at week 12 embryologically?

Answer 53

Taste Pores

Question 54

When does the tongue appear?

Answer 54

Week 4

Question 55

When do taste buds 1st appear?

Answer 55

Week 8

Question 56

What happens in EW 8?

Answer 56

Lingual papillae develop, taste buds 1st appear

Question 57

Glance at Enfamil/Nutramigen study, no questions posted.

Answer 57

Good luck