taste buds/papillae

papillae

filiform increase friction and have tacttile receptors

gustatory receptors cell gustatory hairs

extend through taste pore

gustatory receptors cell respond to

dissolved chemicals

gustory receptors cell synapse with

first order bipolar neurons

supporting cells surround

receptor cells in oval body of taste bud

basal cells

stem cells produce supporting cells

receptor on gustatory hair bind with

tastant dissolved in saliva

receptor on gustatory hair produces

receptor potential

receptor on gustatory hair leads to

action potential if threshold

variable threshold lowest

for bitter, then sour

variable threshold higher for

salty and sweet

quick adaptation

decreases sensitivity within minutes after continuous stimulation

anterior 2/3 of tongue

facial

posterior 1/3 of tongue

glossopharyngeal

throat and epiglottis

vagus

medulla oblongata synapse of

first order sensory neurons

medulla oblongata project to

thalamus or limbic system/hypothalamus

thalamus

axons project to cerebral cortex primary gustatory area of parietal lobe for conscious perception of taste