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Related Concept Videos

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...
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...
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...
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Neuron Structure01:30

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Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other using neurotransmitters at specific junctions called synapses. Neurons come in many shapes that often relate to their function, but most share three main structures: an axon and dendrites that extend out from a cell body.
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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
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The Olfactory System as a Model to Study Axonal Growth Patterns and Morphology In Vivo
08:29

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Published on: October 30, 2014

Dendrodendritic synapses and functional compartmentalization in the olfactory bulb.

Kensaku Mori1, Hideyuki Matsumoto, Yusuke Tsuno

  • 1Department of Physiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. moriken@m.u-tokyo.ac.jp

Annals of the New York Academy of Sciences
|August 19, 2009
PubMed
Summary

Mammalian olfactory bulb maps organize odorant receptors into zones. Understanding dendrite spatial distribution within these zones is key to decoding olfactory signal integration and odor-induced behaviors.

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Area of Science:

  • Neuroscience
  • Olfactory System Research
  • Sensory Processing

Background:

  • Odorant receptor maps in the mammalian olfactory bulb exhibit zonal and domain organization.
  • This spatial organization is linked to specific odor-elicited behavioral responses.
  • Mitral/tufted cells connect via dendrodendritic synapses with granule cells across different odorant receptor channels.

Purpose of the Study:

  • To investigate the spatial distribution of long dendrites from mitral and tufted cells.
  • To correlate dendrite distribution with the zonal and domain organization of odorant receptor maps.
  • To elucidate the logic of signal integration from distinct odorant receptor channels in the olfactory bulb.

Main Methods:

  • Analysis of spatial relationships between neuronal structures in the olfactory bulb.
  • Mapping of odorant receptor expression and neuronal connectivity.
  • Correlation of anatomical data with functional olfactory processing.

Main Results:

  • Identified specific spatial arrangements of mitral/tufted cell dendrites relative to olfactory bulb zones and domains.
  • Demonstrated a correlation between dendrite distribution patterns and the functional organization of odorant receptor channels.
  • Provided insights into how signal integration occurs across different odorant receptor inputs.

Conclusions:

  • The spatial distribution of dendrites is a critical factor in olfactory signal integration.
  • Understanding these anatomical relationships enhances our comprehension of olfactory processing and odor-induced behaviors.
  • This research provides a framework for further investigation into the neural circuitry of olfaction.