Special Senses III Flashcards
What are the signals for spicy food?
Nociceptors
What is the chemical for spice? What is its MOA?
Capsaicin–Opens VR1 receptor
What are the 5 taste sensations?
Sour Salty Sweet Bitter Umami
True or false: At moderate concentrations of taste stimuli, sour, salty, sweet and bitter tastes can be perceived by stimulating any area containing taste receptor cells
True
Where are the taste buds on the tongue?
In the trenches along papilla
The tip of the tongue is most sensitive to what tastes? (3)
Sweet
Umami
Salt
The sides and back of the tongue are more sensitive which two tastes?
Sour and bitter
What happens if you cut the nerve to a taste bud?
Oh yeah, it dies
True or false: the basal cells can turn into taste buds
True
True or false: we all have about the same number of taste buds
False
True or false: taste has a strong genetic component
True
What is the innervation to the anterior 2/3 of the tongue?
C VII
What is the innervation to the posterior 1/3 of the tongue?
CN IX
What is the innervation of the soft palate?
CN VII
What is the innervation of the epiglottis and esophagus?
CN X
Where do all of the taste tract combine? What part of the thalamus does this area then project to?
Nucleus of the solitary tract, then to the ventral posterior medial nucleus of the thalamus
What part of the cortex senses tastes?
Insular taste cortex
What is the role of the amygdala in taste?
Motivation of food
How are salt and sour sensed?
Opens an ion channel
How are sweet, bitter, and umami sensed?
G-protein coupled receptor
Depolarization of taste cells cause what?
release of neurotransmitters onto primary afferent nerves.
True or false: there is a labeled line to the taste cortex
True
What is the bait-shyness (Sauce Bearnaise) phenomenon?
Losing taste for a food that the brain associated with sickness
What is hypogeusia?
Decreased taste sensation
