Gustatory and Olfactory Pathways Flashcards
What are the 1st order neurons of the gustatory pathway (3)
- Geniculate ganglion (CN7)- ant 2/3 of tongue
- Inf ganglion of CN9- post 1/3 of tongue
- Inf ganglion of CN10- free taste buds bw tongue and epiglotic
What type of taste buds on ant 2/3 and post 1/3 of tongue
ant 2/3- folate papilae
post 1/3- free taste buds
Where is teh 2nd order neuron of the gustatory pathway and where is it located
Solitary nucleus in medulla
How does the 2nd order neuron travel to the 3rd order neuron in gustatory tract
ascend thru tegmental part of pons and midbrain and form solitary lemniscus
What is the 3rd order neuron of the gustatory path
VPM of thalmus
What is the cortical projection of gustatory pathway
Form thalamic radiation and project to parietal operculum (area 43) MOSTLY IL
What is the first order neuron of the olfactory path and where is it located
olfactory receptor cell- bipolar cell located in the olfactory mucosa (has peripheral process with short cilia)
What is the 2nd order neuorn of the olfactory path and where is it located
2nd order neuron is the mitral cell located in the olfactory bulb
Where does the olfractory tract divert into 2 separate tracts
At level of the anterior perforating substance
What are the 2 seperate olfactory stria
Medial olfactory stria- Crosses midline and enters CL olfactory bulb (enhance taste)
Lateral olfactory stria- projects into IL olfactory cortex and prepifiform
Does the olfractory path bypass thalmus
yes
What is Ageusia and what is most likely affected
Loss of tast sensation
-mc a peripheral condition (maybe central if ms)
What is Anosmia and what is most likely affected
Loss of sense of smell
-mc peripheral condition (degen of olfactory mucosa
