chemical senses Flashcards
(25 cards)
What are the 5 tastes
salty, sour, sweet, bitter, umami
describe transduction of gustation
taste stimuli bind ion channels, 2nd messengers than depolarization and flux of ions and Ca is released on afferent n at base of taste cell
what are the hair cells of taste cells
microvilli
what nn innervate taste buds
VII IX or X
do taste cells have axons
no, release NT on nerve endings
what inn the anterior 2/3 tongue
CN VII
what inn posterior 1/3 tongue
CN IX
what inn epiglottis
CN X
where do afferents from taste project to
ipsilateral to the nucleus of solitary tract
where do oral trigeminal afferents project
caudal nucleus of solitary tract
what are the associated ganglions for VII IX X taste
VII geniculate
IX petrosal
X nodose
Where is the solitary nucleus in a cross section
medulla, caudal pons too
what are the central projections of taste
VPM of thalamus
parabrachial nucleus in rostral pons
where is the gustatory Cx
insula
what are the 2 paths for olfaction
orthonasal (up nose)
retronasal (throat and up)
is just one molecule needed to produce an odor
no many many molecules
describe the olfaction sensing cell
olfactory cilia have odor receptor proteins
the cell is a true bipolar neuron
does an odor receptor respond to one or multiple odorants
each odor receptor responds to multiple odorants
how many receptros can one odorant stimulate
many
describe the code for odor perception
a particular odorant activates a pattern of glomeruli
what axons form the olfactory tract
mitral cell axons
what are the central projections of the olfactory bulb
anterior olfactory nuclei olfactory tubercle piriform Cx amygdala periamygdaloid Cx entorhinal Cx
does olfaction go through thalamus
no, the one exception
what are the projections of the primary olfactory Cx
thalamus hippocampus orbital Cx olfactory bulb hypothalamus
