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Related Concept Videos

Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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A Step-by-Step Guide to Mosquito Electroantennography
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Neuromodulators in the mosquito olfactory system.

Kartik Rout1, Karthikeyan R Kannan1, Nitin Gupta2

  • 1Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India.

Current Opinion in Neurobiology
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Summary

Mosquitoes

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Area of Science:

  • Neuroscience
  • Entomology
  • Olfactory system research

Background:

  • Mosquitoes rely on olfaction for crucial behaviors like host-seeking and reproduction.
  • Behavioral responses to odors change based on internal state (e.g., after blood-feeding) and environment.
  • These olfactory modulations are sex-specific and involve complex neural processing.

Purpose of the Study:

  • To review the expression and function of neuromodulators in the mosquito olfactory system.
  • To highlight the sex-specific roles of these neurochemicals in modulating mosquito behavior.
  • To provide a comprehensive overview of key neuromodulators influencing mosquito olfaction.

Main Methods:

  • Literature review focusing on expression profiles and functional roles.
  • Analysis of studies on monoamine neuromodulators (dopamine, serotonin, octopamine, tyramine).
  • Examination of research on neuropeptides (e.g., FMRFamide, SIFamide, allatostatin A).

Main Results:

  • Neuromodulators like dopamine and serotonin play critical roles in olfactory processing.
  • Neuropeptides significantly influence mosquito behaviors, including host-seeking and oviposition.
  • Expression and function of these molecules are often sexually dimorphic, impacting behavior differently in males and females.

Conclusions:

  • Neuromodulators orchestrate dynamic changes in the mosquito olfactory system.
  • Understanding these neurochemical pathways is key to controlling mosquito behavior.
  • Sex-specific neuromodulation is a fundamental mechanism governing mosquito sensory perception and behavior.