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Related Concept Videos

Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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...
Olfaction01:25

Olfaction

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...
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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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Related Experiment Video

Updated: May 12, 2026

Extracellular Multi-Unit Recording from the Olfactory Nerve of Teleosts
07:02

Extracellular Multi-Unit Recording from the Olfactory Nerve of Teleosts

Published on: October 6, 2020

Neural circuits mediating olfactory-driven behavior in fish.

Florence Kermen1, Luis M Franco, Cameron Wyatt

  • 1Neuroelectronics Research Flanders Leuven, Belgium ; Vlaams Instituut voor Biotechnologie Leuven, Belgium.

Frontiers in Neural Circuits
|April 19, 2013
PubMed
Summary
This summary is machine-generated.

This review explores fish olfactory systems, focusing on less-understood target brain areas. Understanding these areas in zebrafish can reveal neural circuits for odor-driven behaviors like foraging and alarm responses.

Keywords:
anatomy and physiologybehaviorhabenulahypothalamusolfactory bulbolfactory epitheliumteleostzebrafish

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Sensory Systems Biology

Background:

  • The fish olfactory system is vital for survival behaviors, including foraging, courtship, and alarm responses.
  • While upstream areas like the olfactory epithelium and bulb are studied, downstream target areas remain less understood.
  • The precise role of these target areas in generating odor-driven behaviors requires further investigation.

Purpose of the Study:

  • To review existing literature on the anatomy, physiology, and behavioral roles of fish olfactory target areas.
  • To highlight knowledge gaps concerning the function of these brain regions.
  • To propose a framework for future research, particularly using zebrafish, to understand neural computations.

Main Methods:

  • Comprehensive literature review of olfactory system anatomy, physiology, and behavior in teleost fish.
  • Analysis of existing research on olfactory bulb targets and their connections.
  • Discussion of technological advancements applicable to studying olfactory circuits.

Main Results:

  • Identified key olfactory target areas in teleost fish.
  • Summarized current knowledge on their physiological responses and behavioral outputs.
  • Highlighted the need for integrated approaches to study these circuits.

Conclusions:

  • Further research into olfactory target areas is crucial for understanding odor-driven behaviors.
  • Zebrafish offer a promising model system for elucidating neural circuit computations.
  • This review provides a foundation for future studies on fish olfaction and behavior.