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histo 2 > travers 3 (sensation) > Flashcards

travers 3 (sensation) Flashcards

1
Q

What arch is the mucosa of the body of the tongue from

A

arch 1

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2
Q

What arch is the mucosa of the root of the tongue from

A

arch 3

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3
Q

What cranial nerves innervate taste buds

A

VII, IX, X

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4
Q

What cranial nerve supplies somatosensory innervation to the anterior mouth

A

V

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5
Q

What cranial nerve supplies somatosensory innervation to the posterior tongue and pharynx

A

IX

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6
Q

What fibers detect touch

A

A beta and A delta

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7
Q

What fibers detect warming

A

c fibers

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8
Q

what fibers detect cooling

A

A delta

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9
Q

What fibers detect pain

A

a delta and c fibers

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10
Q

Large fibers detect:

A

touch

A beta

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11
Q

Small fibers detect:

A

thermal and pain

A delta, C

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12
Q

What mechano receptors are found in the mucous membrane

A

merkel

meissner

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13
Q

Meissner’s corpuscle:

fiber type?
location?
encapsulated?

A

fiber type: large axons (A beta and larger A delta)

location: in superficial lamina propria between rete pegs
encapsulate: yes by shwann cells

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14
Q

Merkel receptor:

fiber type?
location?
synapse?

A

fiber type: large axons (A beta and larger A delta)

location: apices of rete pegs

merkel cells synapse on merkel receptors

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15
Q

Which receptors are rapidly adapting

A

Meissners

due to cushioning of encapsulation

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16
Q

Which receptors are slowly adapting

A

Merkel

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17
Q

Both Meisser & Merkel receptors have very low thresholds but differ in their response to the dynamic aspects of the stimulus.

T/F

A

T

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18
Q

Both Meissner and Merkel receptors can code painful sensations. T/F

A

F, neither can encode pain

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19
Q

What types of fibers encode pain

A

A delta, C

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20
Q

What senses spiciness

A

Not taste system

pain receptors

TRPA1 (also in pulp–responds to inflammation)

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21
Q

How many taste buds are there in an average mouth

A

8000

22
Q

What branchial arches are associated with fungiform papillae

A

location: dorsal anterior (arch 1)
sensation: chorda tympani VII (arch 3)

23
Q

Where are taste buds located on fungiform

A

dorsal surface (on top)

24
Q

What innervates filiform

A

only somatosensory

no taste buds!

25
Q

What CN is associated with foliate papilla

A

IX

26
Q

What papilla are closely associated with von ebner glands

A

foliate, circumvallate

27
Q

Which papilla has the most taste buds

A

circumvallate

28
Q

What CN is associated with circumvallate

A

IX

29
Q

What is the main function of taste buds on the larynx

A

respond to deviations from isotonicity

signal to protect the airway

30
Q

A taste map of the tongue is accurate. T/F

A

F

31
Q

A single fungiform papillae can usually detect more than one quality. T/F

A

T

32
Q

If you lose one of your chorda tympani nerves your ability to taste will be reduced by half. T/F

A

F

taste is very redundant – you probably wouldn’t notice a difference if the flavor was applied to your entire tongue

33
Q

The number of taste papilla varies greatly among individuals, but their taste ability remains fairly constant. T/F

A

T

34
Q

What family of receptors can detect bitter taste

A

tas2r

35
Q

What key molecule in vegetables causes people with sensitive tas2r receptors to detect more bitter taste

A

glucosinolates

36
Q

People with sensitive tas2r receptors eat less cruciferous vegetables. t/f

A

t

37
Q

How does people’s perception of sweetness change

A

only one type of receptor, but promoter region determines how many receptors you will have

38
Q

Dark type I taste bud cells role?

A

stain for glial markers

indicates supportive role

39
Q

Light taste bud cells have microvilli that reach the taste pore and express receptors for taste substances. t/f

A

t

40
Q

What do type III light cells detect? Do they synapse with the primary afferent nerve?

A

sour

yes they synapse w nerve

41
Q

What do type II light cells detect? Do they synapse with the primary afferent nerve?

A

bitter, sweet, amino acids

do not synpase

42
Q

How do type II cells communicate with brain?

A

use ATP as a transmitter

you don’t need a typical synapse for this

43
Q

Taste buds are modified epithelial cells. However, they are not replaced throughout life. t/f

A

first sentence true

last sentence false

44
Q

What role does SHH play in taste bud development?

A

released from precursor cells, acts on surrounding cells to maintain taste buds

45
Q

What happens if you introduce a SHH antagonist?

A

your taste buds get fucked up and you can’t taste shit

46
Q

Final differentiation of the taste bud requires neural innervation. t/f

A

t

without nerve, taste bud will not develop

if your primary afferent nerve is damaged, taste buds will die

47
Q

What molecules are important for taste bud development and tooth development?

A

wnt
bmp
SHH
FGF

48
Q

When does the tongue appear

A

4th week IU

49
Q

When do the taste buds first appear

A

8th week IU

50
Q

When do the taste pores first appear

A

12th week IU

histo 2 (8 decks)

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