Hursh Patel Sharon Li. Why do you think taste and smell work so closely together? How many taste...
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Transcript of Hursh Patel Sharon Li. Why do you think taste and smell work so closely together? How many taste...
Why do you think taste and smell work so closely
together?
How many taste buds does an average human
have?
What is a Tastant?
What is an odorant?
Do Now
Taste and smell are closely involved with each other
◦ Perception of chemicals in the air and in our food
◦ Food “tastes” different when the sense of smell is damaged
It explains why food tastes differently when a person is sick.
Taste and Smell: Why?
Tastants are chemicals in food
◦ Detected by taste buds
5,000-10,000 taste buds
1 taste bud contains 50-100 specialized sensory cells
located on the papillae
Distinguishes chemicals
Sweet, salty, sour, bitter, umami (savory)
The Mouth
Signals are transferred to the ends of nerve fibers
◦ Sends impulses along cranial nerves to taste regions in the
brainstem
◦ Impulses are relayed to the thalamus and onto Caudal
Orbital cortex
How the mouth sends signals…
Odorants are airborne odor molecules
◦ Mucus membrane is found at the roof of the nose
◦ Contains sensory neurons through perforations (pores) through the bone
◦ Cilia receive odorant stimuli at sensory neuron tips
The Nose
Signaling begins at the roof of the nose
◦ Signals are sent to olfactory bulbs
◦ Then processed in Caudal Orbital cortex
How the nose sends signals…
The activity pattern of odorants acting on receptors are sent to
the olfactory bulbs
◦ Then it forms a spatial map to be able to recognize smells.
◦ This information is sent to the primary olfactory cortex
Smell perception