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Olfaction

Nose

Sense of smell

Occurs in response to airborne molecules calledodorants

Consists of Olfactory Neurons

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Olfactory Neurons

Bipolar neurons within the Olfactory Epithelium

Dendrites of the Olfactory Neurons extends to theepithelial surface and the ends are modied with lonthat lie in a thin mucuslm

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Odorants

a substance giving o a smell especially one used to giveparticular scent or odour to a product

Airborne Odorants become dissolved in the mucus onsurface of the epithelium and bind to receptor molecules

membranes of the speciali!ed cilia "he binding of the odorant to the receptor initiates action

potentials which are then conducted to the olfactory cortthe Cerebrum by sensory neurons

"here are at least #$$ Olfactory receptors in human%

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Neural &athwa

for Olfaction

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"aste

"ongue

the sensation of 'avor perceived in the mouth and thon contact with a substance%

Taste buds

Divided into 5 BASIC types namely( SWEET, SOURSAT!, "#TTER, U$A$#% "hey are the reason whycan perceive many di% tastes

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"aste buds

)re sensory structures that detect taste stimuli

Oval shaped structures located in the surface of thetongue%

Can also be found in the di% areas of the mouth and

pharynx

Consists of * types of cells Speciali&ed Epithelia'ells +,xterior supporting capsule of each taste buTaste cells +.nterior supporting capsule-

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"aste Cells

Contains hair li/e processes called 0taste hairs1

"aste hairs extend into a tiny opening in the surrounstratied epithelium called a 0taste pore1

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Neural &athways

for "aste