Lecture 11: Gustatory and Olfactory Systems Flashcards Preview

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Flashcards in Lecture 11: Gustatory and Olfactory Systems Deck (20)
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1

The three types of papillae

vallate
foliate
fungiform

2

Vallate
papillae # and # of taste buds for each

papillae = 8-9
250 taste buds each

3

Foliate
papillae # and
total # of taste buds on each side

papillae = 20 each side
100-150 taste buds each side

4

Fungiform
papillae # and
# of taste buds for each

papillae = 200-300
3-5 taste buds each

5

What is the normal variation in the number of taste buds for each person that accounts for the different thresholds for taste?

100 fold variation

6

Where can the 4 basic tastes be found on the tounge?

Can be percieved at any spot on the tongue where there are taste receptors

7

Where else can taste receptors be found and why?

The palate and pharynx
Involved in swallowing and reflex responses to good or bad tastes

8

What cranial nerves, name and number, innervate the taste receptors?

CN VII; facial
CN IX; glossopharyngeal
CN X; vagus

9

Where do the CN that innervate taste buds report to?

The Nucleus of the solitary tract

10

What does the structure of the sweet and bitter taste receptors allow for?

Amplification of the stimulus

11

What does increasing intracellular Calcium and causing vesicles of ntx to be released onto gustatory nerve describe?

Amplification

12

What all consists of the Central Gustatory Pathway?

CN 7, 9, 10
Solitary Nucleus & Tract on insula
Ventral Posteromedial Nucleus of the Thalamus (VPM)

13

How large of an area do olfactory epithelium take up

5 cm^2

14

How many olfactory neurons are there roughly?

several million

15

Why are the olfactory neurons unique?
(Life span + Cilia)

30-60 day lifespan and are replaced by basal cells
Cilia specialized for odor detection by binding dissolved oderants in a mucus layer

16

What structure of cell is the olfactory neuron?

Bipolar

17

How many different types of odorant receptors are there?

more than 1000

18

What does the influx of Sodium and Calcium cause in olfactory transduction?

Amplification

19

How many seconds does it take to adapt to a new smell?

7 seconds

20

What relay does the olfactory senseory pathway partially bypass and why?

The initial thalamus relay
Because it is very old