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Large-scale Three-dimensional Imaging of Cellular Organization in the Mouse Neocortex
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When complex neuronal structures may not matter.

Adriane G Otopalik1, Alexander C Sutton1, Matthew Banghart2

  • 1Volen Center, Biology Department, Brandeis University, Waltham, United States.

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|February 7, 2017
PubMed
Summary
This summary is machine-generated.

Morphological variability in Gastric Mill (GM) neurons does not affect their function. Electrotonic compactness in these neurons provides a solution for structural variations in the crustacean stomatogastric ganglion (STG).

Keywords:
Cancer borealiselectrotonusmorphologyneurosciencestomatogastric ganglionvariability

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Crustacean Neurobiology

Background:

  • Animal-to-animal variability in ion channel expression is well-studied.
  • The physiological impact of morphological variability in neurons remains largely unknown.
  • The Gastric Mill (GM) neuron in the crustacean stomatogastric ganglion (STG) exhibits conserved physiological properties despite morphological variability.

Purpose of the Study:

  • To quantify animal-to-animal variability in cable lengths and branching patterns of GM neurons.
  • To investigate the physiological consequences of this morphological variability on neuronal function.
  • To understand how GM neurons maintain consistent physiological properties.

Main Methods:

  • Quantified morphological variability in GM neurons from *Cancer borealis*.
  • Measured passive electrotonic structure using focal glutamate photo-uncaging and TTX.
  • Analyzed inhibitory response amplitudes and apparent reversal potentials (Erevs) across multiple sites.

Main Results:

  • GM neurons display significant morphological variability (CV = 0.4).
  • Apparent Erevs were invariant across recording sites, indicating electrotonic compactness (estimated λ > 1.5 mm).
  • Inhibitory responses were measured at distances of 100-800 µm from the soma.

Conclusions:

  • GM neurons are remarkably electrotonically compact.
  • Electrotonic compactness offers a mechanism to accommodate morphological variability.
  • This structural property, combined with graded transmission, ensures functional consistency in the STG.