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Related Experiment Video

Updated: Jul 29, 2025

Large-scale Three-dimensional Imaging of Cellular Organization in the Mouse Neocortex
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Cyclic structure with cellular precision in a vertebrate sensorimotor neural circuit.

Runzhe Yang1, Ashwin Vishwanathan2, Jingpeng Wu2

  • 1Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08540, USA; Computer Science Department, Princeton University, Princeton, NJ 08540, USA.

Current Biology : CB
|May 26, 2023
PubMed
Summary

The zebrafish oculomotor system exhibits a novel 3-cell cyclic wiring pattern, unlike the feedforward C. elegans connectome. This cyclic neuronal organization may be crucial for oculomotor functions and temporal integration.

Keywords:
EM connectomeconnectivity motifsoculomotor system

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Computational Neuroscience

Background:

  • Electron microscopy enables detailed reconstruction of neuronal wiring diagrams.
  • The Caenorhabditis elegans connectome is largely understood as a feedforward sensorimotor circuit.
  • Overrepresentation of 3-cell feedforward loops supports this model in C. elegans.

Purpose of the Study:

  • To analyze the sensorimotor wiring diagram of a larval zebrafish brainstem.
  • To compare the organizational principles with the C. elegans connectome.
  • To investigate the functional relevance of observed neuronal motifs in oculomotor control.

Main Methods:

  • Reconstruction of the larval zebrafish brainstem connectome via electron microscopy.
  • Analysis of neuronal motifs, specifically focusing on 3-cell structures.
  • Application of stochastic block models (SBM) to understand network organization.
  • Comparison of identified motifs with existing connectomic data.

Main Results:

  • A 3-cell cycle motif is highly overrepresented in the zebrafish oculomotor module.
  • This cyclic structure is a novel finding in electron microscopy-reconstructed connectomes.
  • Cellular cycles show greater specificity than group cycles, with common recurrence to the same neuron.
  • Cyclic structure coexists with the vestibulo-ocular reflex arc.

Conclusions:

  • The zebrafish oculomotor system displays a significant cyclic organization, contrasting with the feedforward C. elegans model.
  • Cyclic neuronal connectivity may play a role in oculomotor functions requiring recurrent processing.
  • This finding suggests potential relevance for recurrent network models in temporal integration within the oculomotor system.