Chemosensation Flashcards Preview

aNeuro Exam 3- Lindsey's > Chemosensation > Flashcards

Flashcards in Chemosensation Deck (30)
Loading flashcards...
1

Sweet, bitter, and umami tastes are transmitted via _____ receptors.

metabotropic GPCRs

2

What is the receptor cell for chemmesthesis? What CN does it use?

  • free nerve ending of cranial ganglion cells
  • CN 5

3

Where is the primary sensory nucleus in the CNS for olfaction?

olfactory bulb

4

This is the term for the loss of taste.

Ageusia

5

Parosmia

Altered perception of smell in the presence of an odor, usually unpleasant

6

How are the neural pathways different for taste and smell?

taste has to go thru the thalamus, but smell does not

7

In taste, where do the thalamic neurons send their axons?

to the insular cortex

8

This is an altered perception of smell in the presence of an odor; usually unpleasant .

Parosmia

9

Salty and sour tastes are transmitted via _____ receptors.

ion channels

10

Hyposmia

diminished sense of smell

11

Taste involves stimulation of what 3 sensory systems?

  1. olfaction
  2. gustation
  3. chemesthesis

12

What are the 2 routes that odorants take into the body?

  • Ortho-nasal = through nostrils
  • Retro-nasal = mouth --> through the concha --> olfactory epithelium

13

Where are the 2nd order cells for taste?

medial part of the ventrobasal thalamus (VPMpc)

14

This is an altered/distorted sense of smell.

dysosmia

15

What is the receptor cell for taste? What CN does it use?

  • a modified epi cell
  • CN 7, 9, 10

16

Anosmia

a sudden loss of smell

17

What is the receptor cell for olfaction? What CN does it use?

  • a cilitated, bipolar neuron
  • CN1

18

Where is the primary sensory nucleus in the CNS for chemesthesis?

spinal trigeminal nucleus

19

What is the term for the diminished sense of smell?

hyposmia

20

Dysosmia

altered/distorted sense of smell

21

What is the significance of the Entorhinal cortex?

feeds into hippocampus --> storage and retrieval of memories

22

Olfactory axons project directly onto the ______.

  • olfactory cortex
  • a portion of the amygdala

23

A sudden loss of smell is called?

anosmia

24

What part of the brain gives conscious appreciation of smell?

the Orbitofrontal cortex

25

Ageusia

loss of taste

26

Anosmia can often lead to ____.

severe depression

27

Phantosmia

Perception of smell without an odor present

28

What are the 3 kinds of taste papillae? Where are they found? What CN innervates them?

  1. fungiform (anterior): facial- 7
  2. foliate (sides): facial - 7
  3. circumvallate (posterior): glossopharyngeal - 9

29

This is the perception of smell without an odor present.

Phantosmia

30

Where is the primary sensory nucleus in the CNS for taste?

nucleus of solitary tract