1D Gustation Flashcards
How many different chemicals can we distinguish with our taste buds?
4000-10,000
Where are taste buds found?
Upon papillae over the tongue, palate, pharynx and epiglottis
Where are fungiform taste buds found mostly?
Scattered over entire tongue surface but most abundant at its tip and along its anterior sides
What does the fungiform taste bud respond to mostly?
Mainly sweet and salty substances, but also sour
Which CN innervates the taste buds on the back of the throat and epiglottis? Taste buds on the palate?
CN X.
CN VII
Where are foliate papillae most abundant? What taste to they respond to?
Middle edges of the tongue. Sour
Which nerve innervates taste buds on fungiform papillae and some of the foliate papillae in the anterior 2/3 of the tongue?
Chorda tympani branch of the CN VII
Which taste bud papillae are the largest and least numerous? Where are they found?
Circumvallate. At the back of the tongue - form an inverted V
What taste to circumvallate respond to?
Bitter
What are the taste buds on the circumvallate and some of the foliate papillae innervated by in the posterior 1/3 of the tongue?
CV IX
Are tongue maps realistic?
No, taste stimuli are spread relatively equally across the tongue - some areas just have a relative greater tendency to respond to bitter, sour, etc.
Taste buds include what three types of cells?
Taste receptor cells (TRCs), basal, and supportive cells.
What cells give rise to the taste pore?
TRC
What do TRCs have at their tips?
Microvilli
Are taste receptor cells neurons?
No, they synapse onto afferent nerve endings of CNs VII, IX, and X
