Chemical senses Lec 15

Question 1

Pathways for olfactory processing

Answer 1

Olfactory tract
piriform cortex located at tip of temporal lobe
info then goes in many directions
-Neocortex via thalamus
-Lateral hypothalamus
-Hippocampal formation

Question 2

Depolarization of olfactory cell results in

Answer 2

cAMP increase via G-protien

• binds ion channel
• allows Ca to enter
• binds Cl channel to boost signal

turn off signal
-CaM and Na/Ca exchanger

Question 3

RULE of projection of epithelium onto olfactory bulb

Answer 3

One OR=one glomerulus

Question 4

OE contains

Answer 4

Basal cells
Neurons
Supporting cells

Question 5

OE neurons

Answer 5

Bipolar
apical dendrite
Thin unmyelinated axon that projects to bulb

Question 6

OE basal cells

Answer 6

Continually undergo mitotic division
Sensory neurons have life span of approx 30 days
Part of CNS

Question 7

Taste buds innervated by cranial nerves

Answer 7

VII
IX
X

Question 8

Gustatory axons innervate the

Answer 8

Nucleus of the solitary tract

Question 9

Nucleus of solitary tract has projections to

Answer 9

VPM of thalamus
hypothalamus
Amygdala
-all project to insula and frontal cortex

Question 10

4 Primary taste fields

Answer 10

Circumvallate- back of tongue
Foliate- side of tongue
Fungiform- top of tongue
Soft palate

Question 11

Bitter

Answer 11

back of tongue

Question 12

Sour

Answer 12

Sides of tongue

Question 13

Sweet/umami

Answer 13

front half of tongue

soft palate

Question 14

Salty

Answer 14

tip of tongue

Question 15

Salt and sour stimuli

Answer 15

ion channels

- increase Ca and NT release

Question 16

Sweet, bitter and umami

Answer 16

G-protein

• increase cAMP
• stimulate Ca channel via IP3

Question 17

Trigeminal system

Answer 17

Conveys oral irritation