Flashcards in Gustation and Olfaction Deck (26):
Where are taste buds found?
What are the 3 types of papillae?
What are the features of circumvallate papillae?
Located at the posterior of the tongue in a V shape
Large numbers of taste buds are found on the walls of these papillae
What are the features of fungiform papillae?
Found at anterior surface of tongue
Taste bugs on surface of papillae
What are the features of folate papillae?
Found on the lateral marginas are of the tongue
Which cells differentiate into new taste cells?
What are the 5 taste categories?
What is umami?
Taste caused by L-glutamate
Found in meats and aged cheese
How does the taste threshold relate to different tastes?
Bitter and sour tastes have a much lower taste threshold than sweet and salty
This is because bitter and sour tastes are generally associated with more dangerous substances
Which taste cells have metabotrophic pathways?
Which taste pathways have ionotrophic pathways?
What are the receptor cells in the olfactory system?
Describe the mechanism of the olfactory pathway
1. Odorant molecule binds to 7 transmembrane protein of primary olfactory neuron
2. Activated receptor activates a G-protein, which stimulates AC to convert ATP --> cAMP
3. cAMP activates the cation channel, making it permeable to sodium and calcium
4. Influx of cations causes depolarisation leading to APs
What does the Bowman Gland secrete?
What forms the olfactory knob?
Lower end of bipolar neurons extending into mucus layer
Which structure detects the odorants in the nasal cavity?
Which cells differentiate into bipolar cells?
What connects bipolar neurons to the CNS?
Where does olfactory information from bipolar cells pass to?
Dendrites of mitral cells found in the neuropil of the glomeruli in the bulb
Which cells provide lateral inhibition for signal enhancement of olfactory signals?
Which cells make dendritic connections between mitral cells?
How many odour receptor genes does each bipolar neurone express?
Name the 7 categories of odours
Which olfactory pathway feeds into the limbic system encoding the emotional aspects of odour?
Medial olfactory pathway
What are causes of anosmia?