Sensory System - Taste Flashcards
The first stage for perception of the environment is to transmit sensory information to the _____ _____
cerebral cortex
What structure is found on the surface of the tongue that gives it the rough texture?
papillae
What are the 2 kinds of papillae
- Fungiform Papillae
- Circumvallate Papillae
Where is Fungiform Papillae found?
soft palate, internal cheeks, pharynx, epiglottis and predominantly on the ends and sides of the tongue
Where are circumvallate papillae found?
toward the back of the tongue
The papillae contain taste buds that consist of epithelial cells. what are the 3 types of epithelial cells
- supporting cells
- gustatory cells
- basal cells
Gustatory cells are the chemoreceptors containing microvilli that adapt to stimuli in 1-5 minutes. Which means that they produce action potentials.
True or False
False
because the microvilli adapt to stimuli, they are not producing action potentials.
What is the function of basal cell
To renew the supporting cells and gustatory cells every 7-10 days
The receptor for flavours are scattered over the tongue, but a general rule is that the salty receptors and found at the _____ of the tongue while the ______ can be found toward the back of the tongue
Salty (front portion of tongue)
Bitter (Back Portion of tongue)
When drinking a glass of wine some flavours are perceived from the receptors on the tip of the tongue, but then there is a bitter aftertaste because wine flows slowly to the back of the tongue and the bitter receptors are located there.
True or False
True
What is Umami?
A meaty flavour triggered by glutamate (MSG) and its receptors are distributed all over the tongue
There are 5 types of gustatory cells. What are they?
- Salty
2.Sour - Sweet
- Bitter
- umami
What is the mechanism of transduction for sour flavours?
Hydrogen Ions enter the tongue through the sodium ion channel, producing depolarization, calcium entry and the release of the neurotransmitter
The substance in solution stimulates the chemoreceptors of the gustatory cells which then release neurotransmitter to activate the neuron of the facial nerve (VII), glossopharyngeal nerve (IX) or vagus nerve (X)
True or False
True
These cranial nerves will project to the nucleus of the ________
Medulla
After the neurons are sent to the medulla they will be sent to the _____
thalamus
From the Thalamus neurons will sent to the _____ for perception of taste.
Cortex
Perception of Taste occurs in the _______
Cortex
