Olfaction and Taste Flashcards
Which three Cranial nerves are involved in taste?
VII Facial, IX Glossopharyngeal, X Vagus
What kind of receptors are involved in taste?
Chemoreceptors
What are the primary tastes?
Sweet, Salty, Sour, Umami(Savory), Bitter
CNVII is responsible for which sensory part of the tongue and is sensitive to which tastes?
Facial
Anterior 2/3 of tongue. Senses sweet and salty.
This helps with food selection
CNIX is responsible for which sensory part of the tongue and is sensitive to which tastes?
Glossopharyngeal
Posterior 1/3 of tongue. Bitter and Sour
Large role in reflexes and swalloing
CN X is responsible for which part of the taste system. What is it most sensitive to?
Vagus. Epiglottis and pharynx. Bitter
Large role in initiating reflexes to protect the airway
Track the pathway for taste from receptor to brain.
- periphery
- brainstem
- solitary tract
- gustatory nucleus in the medulla
- VPM of thalamus
6a. Primary taste cortex(insula)
6b. amygdala (via reticular formation)
____ is the inability to taste; _____ is decreased ability to taste; and _______ is distorted ability to taste
ageusia; hypogeusia; dysguesia
T/F Olfaction is efferent
False… Afferent (sensory only)
_____ receptors turn over in ~ 5 days
_____ receptors turn over in 50 days
Taste - 5 days
Smell-50 days
Where are olfaction receptors located?
olfactory mucosa of nasal cavity
T/F Olfactory nerve is a collection of axon clusters
True
T/F If the cribiform plate is broken, olfactory neurons can regenerate
False. They can only regenerate if harmed below the cribiform plate, in the mucosa
Within the olfactory bulb there are bundles called _____. Which are surrounded by ______ cells.
glomeruli. surrounded by a single schwann cell
Track the olfactory pathway from nerve to cortex
- nerve fibers
- olfactory bulb
- olfactory tract.
- lateral olfactory tract
- amygdala
- thalamus and hippocampus
- Prefrontal cortex
Medial tract goes to basal forebrain limbic structures
