A male Antheraea polyphemus moth

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A male Antheraea polyphemus moth
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Chemoreception

• General chemoreceptors
• Internal chemoreceptors
• Contact chemoreceptors
• Distance or olfactory chemoreceptors

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Chemoreception and taste

• Chemoreception in aquatic animals
• Chemoreception in terrestrial animals
• Insects have chemoreceptive sensilla

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Figure 13.32 Responses of a blowfly contact
chemoreceptor sensillum to stimulatory solutions
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Figure 13.16 Mammalian taste
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Figure 13.16 Mammalian taste
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Figure 13.17 Ionotropic Taste-transduction
mechanisms
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Figure 13.17 Metabotropic Taste-transduction
mechanisms
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Figure 13.17 Metabotropic Taste-transduction
mechanisms
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Processing of taste

• Single taste buds have one type of channel or
  GPCR.
• Cranial nerves carry signals showing multiple
  sensitivities
• CNS may segregate the different responses from
  different populations

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Olfaction and insects

• Sensilla on antennae are similar to taste sensila
• Cells are either odor generalists or odor
  specialists
• Pheromones
• Disparlure released by Gypsy moth
• Bombykol released by silkworm moth

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Figure 13.35 Vertebrate olfactory receptors

• Size of olfactory epithelium
• Humans 2 to 4 cm2
• Dogs 18 cm2
• Cats 21 cm2

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Figure 13.20 Olfactory transduction mechanisms
in cilia membranes of olfactory neurons (Part 2)
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Fig. 13.21 Olfactory neurons project to glomeruli