12/1/16 Taste Olfactory Flashcards
How many neurons on in the taste system?
-3 Neuron system
What is unique about the olfactory sense?
-It bypasses the thalamus and goes straight to the cortex
From the tongue what nucleus does taste go to?
-Nucleus solitarius
What three nerves do taste on the tongue?
- Facial nerve CN VII
- Glossopharyngeal nerve CN IX
- Vagus nerve CN X
From the solitary tract where do the taste neurons go to?
-VPM
T/F
Taste buds have no efferent neurons, they only have afferents.
True
What are the five tastes?
- Umami
- Sweet
- Bitter
- Sour
- Salty
What are the three major taste cell types in the oral cavity?
- Circumvallate
- Foliate
- Fungiform
How many buds do fungiform papilla have?
-2-4 buds each
How many buds to foliate papilla have?
2-9 clefts
How many buds to circumvallate have?
8-12
What CN innervates the foliate and fungiform papilla?
-CN VII Facial
What CN innervates the circumvallate papilla?
-CN IX Glossopharyngeal
What is the ganglia that CN VII uses on the initial neuron?
-Geniculate
What is the ganglia that CN IX uses on the initial neuron?
-Petrosal
What is the ganglia that CN X uses on the initial neuron?
-Nodose
Where does taste occur on the solitary nucleus?
-Rostral portion
Where does the first synapse occur in taste?
-Solitary nucleus
Where does the second synapse occur in taste?
-VPM
From the VPM in the taste sensation where do the neurons go?
Gustatory cortex (insula)
What does the insula receive?
- Taste
- Olfaction
Where do you find the Insula?
-The folds on the inside of the temporal lobe on the inside of the Sylvian fissure
T/F
Damage to the left insula disrupts addiction to cigarette smoking
True
Where do you bifurcate with olfaction?
-Olfactory Trigone
