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Olfaction and Taste
chapter 26
10
Anatomy
Undergraduate 2
02/09/2013

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Term
chemoreceptors (olfactory receptors)
Definition
located in the olfactory epithelium at the roof of the nasal cavity
Term
olfactory receptors
Definition
bipolar neurons; extend cilia out from epithelium into mucus layer to detect odors, axons extend through cribriform plate, form nerves and synapse at olfactory bulb. From there, impulses bypass the thalamus and go directly to the uncus (olfactory area)
Term
chemoreceptors (taste buds)
Definition
non-uniformly distributed throughout oral cavity (dorsal tongue, soft palate, epiglottis, pharynx, interior cheeks)
Term
3 types of papillae containing taste buds
Definition
foliate- located on side walls of posterior tongue
fungiform: mushroom shaped papillae located on the superior surface
circumvallate: arranged in a V formation on posterior surface
Term
taste buds
Definition
composed of a globular arrangement of gustatory receptor cells and basal cells
Term
gustatory receptor cells
Definition
receptor cell responsible for taste sensation, developed from support cells
Term
basal cells
Definition
stem cells that develop into support cells.
Term
taste pore
Definition
opening exposes taste cell microvilli (gustatory hairs) to oral cavity
Term
gustatory hair
Definition
from the gustatory receptor cell- contact with certain chemicals causing the gustatory receptor to depolarize
Term
taste bud impulses
Definition
carried to sensory cortex by facial VII (anterior 2/3 of tongue) glossopharyngeal IX (posterior tongue, and vagus X (pharyngeal area)
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