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Neuro exam 3 > Chemosensation > Flashcards

Flashcards in Chemosensation Deck (22)
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1
Q
Ageusia:
A
loss of taste
2
Q
Anosmia
A
loss of smell
3
Q
test smell
A
scratch and sniff test
4
Q
taste test
A
Patients react to different chemical concentrations in taste testing; this may involve a simple “sip, spit, and rinse” test, or chemicals may be applied directly to specific areas of the tongue.
5
Q
Simple chemosensation test
A
In clinic, 2/3 of people will complain of loss of taste.
However, once you actually check for loss of taste, instead, 90% have actually lost or reduced their sense of smell.
6
Q
Smell: Receptor cell =
A
ciliated bipolar neuron innervated by CN I w/ olfactory bulb as primary sensory nucleus.
7
Q
Taste: Receptor cell =
A
1. modified epithelial cell that synapses onto nerve fiber from cranial ganaglion cell to CN VII, IX, X.
2. The primary CNS nucleus is the NST.
8
Q
Chemisthesis: Receptor cell:
A
1. free nerve ending of cranial ganglion cell innervated by CNV.
2. Detection of irritant chemicals by trigeminal nerve endings.
3. Primary sensory nucleus is Spinal Trigeminal Nucleus.
9
Q
Ortho-nasal =
A
actually through your nostrils.
10
Q
Retro-nasal =
A
through your mouth traveling through the concha to get to the olfactory epithelium.
11
Q
CN 3 exits midbrain at
A
interpeducular cistern
12
Q
CN 4 exits midbrain
A
dorsally, just below inferior colliculus (note it originates in contralateral midbrain and crosses before it exits the brainstem)
13
Q
CN 5 enters/exits
A
the lateral pons. fibers traverse middle cerebellar peduncle
14
Q
CN 6 exits
A
medially at the ponto-medullary junction
15
Q
CN 7/8 exit and enter respectively
A
at cerebello-pontine angle
16
Q
CN 9/10 exit
A
the lateral medulla (between olive and inferior cerebellar peduncle)
17
Q
CN 11 originates
A
From c1-c5 segments of spinal cord
18
Q
CN 11 exits
A
the spinal cord laterally--in between the dorsal and ventral rootlets.
19
Q
CN 12 exits
A
medulla between olive and pyramid.
20
Q
Secondary gustatory cortex is located
A
in the orbitofrtonal surface
areas.
21
Q
Secondary gustatory cortex receives projections from
A
1. the primary gustatory area located on the interior insula
2. olfactory insula
22
Q
Orbitofrontal cortex:
A
where integration of taste and smell leads to perception of FLAVOR!!!