TASTE Flashcards
Taste aka——
gustation
Disorders associated with the sense of taste are life-threatening.
T/F
F
Because of their large size, approximately—- the total number of taste buds are found in ——- papillae.
half
circumvallate
circumvallate papillae are innervated by —— and—.
circumvallate papillae are innervated by CNs VII and IX.
IX
fungiform papillae has——- number of taste buds
3-5
taste cells in fungiform papillae are innervated exclusively by the———
chorda tympani branch of CN VII. 5
ageusia——
hypogeusia——-
hypergeusia———
dysgeusia————, including——
absence of taste
decreased taste sensitivity
increased taste sensitivity
distortion of taste
taste sensation in the absence of taste stimuli
List the taste stimuli and their locations
Sweet- tip Salty-anterior surface Sour-sides Bitter-root Umami-tip
MECHANISM OF TASTE TRANSDUCTION of sweet and umami taste buds
Binds to G protein–coupled membrane receptor
- increased IP3, Ca2+
- Opens TRP channels
- depolarization
MECHANISM OF TASTE TRANSDUCTION of salty taste buds
Na+ ions Enters through membrane Na+ channels (ENaC)
-depolarization
MECHANISM OF TASTE TRANSDUCTION of bitter taste buds
- Binds to G protein–coupled membrane receptor
- increased IP3, Ca2+
- Opens TRP channels
- depolarization
Full meaning of TRP channels
transient receptor potential
MECHANISM OF TASTE TRANSDUCTION of sour taste buds
- H+ ions Enters through membrane Na+ channels (ENaC)
- depolarization
all five taste qualities can be detected over the full surface of the tongue.
T/F
T
different regions of the tongue do not have different thresholds to some taste stimuli .
T/F
F
The tip of the tongue is most responsive to__,——, and——
sweet
salty
umami
Bitter taste buds can be stimulated by——- e.g.——-
Alkaloids
quinine strychnine
Umami Aka——
savoriness
Umami is stimulated by e.g.——- (MSG) - spices
monosodium glutamate
in the gustatory system the receptor cells are not neurons.
T/F
T
three cranial nerves (CNs—-,—-, and—) enter the—, ascend in the — tract and terminate on—- order neurons in the —— located in the——. That project——- to the—— of the——.
-Thirdorder neurons leave the—- and terminate in the—— cortex (in the—- lobe)
VII IX X
brain stem
solitary
second ;solitary nucleus
medulla
ipsilaterally
ventral posteromedial nucleus; thalamus
thalamus; taste; parietal
