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Related Experiment Videos

External tufted cells: a major excitatory element that coordinates glomerular activity.

Abdallah Hayar1, Sergei Karnup, Matthew Ennis

  • 1Department of Anatomy and Neurobiology, Program in Neuroscience, University of Maryland, Baltimore, Maryland 21201, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 30, 2004
PubMed
Summary

External tufted (ET) cells link olfactory nerve input to other juxtaglomerular neurons. Synchronized ET cell activity may amplify sensory signals and coordinate olfactory bulb output.

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Area of Science:

  • Neuroscience
  • Olfactory System
  • Synaptic Plasticity

Background:

  • Olfactory bulb glomeruli are the initial site for synaptic processing in olfaction.
  • Juxtaglomerular (JG) cells, including external tufted (ET), periglomerular (PG), and short axon (SA) cells, reside in glomeruli and are hypothesized to interact.
  • The precise circuitry and functional roles of JG cell interactions remain largely unelucidated.

Purpose of the Study:

  • To investigate the synaptic connections and functional roles of juxtaglomerular neurons within the olfactory bulb.
  • To elucidate the circuitry linking external tufted, periglomerular, and short axon cells.
  • To understand the contribution of these interactions to olfactory processing.

Main Methods:

  • Utilized single and paired whole-cell recordings in the olfactory bulb.

Related Experiment Videos

  • Investigated spontaneous and evoked neuronal activity in juxtaglomerular cells.
  • Analyzed synaptic input and output relationships between ET, PG, and SA cells.

    • Main Results:

    • External tufted (ET) cells exhibit rhythmic theta-frequency bursting and receive direct olfactory nerve input.
    • Periglomerular (PG) and short axon (SA) cells primarily receive input from ET cells, not directly from the olfactory nerve.
    • ET cells form excitatory, glutamatergic synapses onto PG/SA cells, suggesting a key role in transmitting olfactory information.
    • Synchronized bursting activity was observed among ET cells within the same glomerulus and correlated with PG/SA cell activity.

    Conclusions:

    • External tufted (ET) cells serve as a primary excitatory link between olfactory nerve input and other juxtaglomerular (JG) neurons.
    • Synchronous activity among multiple ET cells converging onto single PG/SA cells may amplify weak sensory signals.
    • Coordinated ET cell bursting could play a role in synchronizing and refining olfactory information processing at the glomerular level.