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Visualizing the Developing Brain in Living Zebrafish using Brainbow and Time-lapse Confocal Imaging
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Visualizing the Developing Brain in Living Zebrafish using Brainbow and Time-lapse Confocal Imaging

Published on: March 23, 2020

Forebrain organization in elasmobranchs.

Michael H Hofmann1, R Glenn Northcutt

  • 1Department of Comparative Neuroanatomy, Institute of Zoology, University of Bonn, Germany. mhofmann@uni-bonn.de

Brain, Behavior and Evolution
|September 19, 2012
PubMed
Summary
This summary is machine-generated.

Elasmobranch telencephalon connections were studied in two species. Findings suggest the dorsal pallium is involved in olfactory orientation, challenging previous views.

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Dissection of Organs from the Adult Zebrafish
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Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Ichthyology

Background:

  • Elasmobranch fishes possess large brains, with a significant telencephalon size comparable to some mammals.
  • The organization, connections, and functions of the elasmobranch telencephalon remain largely unexplored.
  • Previous research suggested limited dominance of olfaction in the telencephalon, with other sensory modalities represented in the pallium.

Purpose of the Study:

  • To investigate the intrinsic and extrinsic connections of the telencephalon in two elasmobranch species.
  • To elucidate the role of olfactory pathways and non-olfactory inputs within the elasmobranch forebrain.
  • To re-evaluate the functional significance of the dorsal pallium in elasmobranchs.

Main Methods:

  • Utilized neuroanatomical tracer injections into various forebrain regions of thornback guitarfish (Platyrhinoidis triseriata) and spiny dogfish (Squalus acanthias).
  • Mapped olfactory pathways and their involvement with the pallium.
  • Identified major descending projections from the dorsal pallium to subpallial structures.

Main Results:

  • Olfactory pathways were extensive, involving the pallium and receiving input from the area basalis.
  • Non-olfactory input from the diencephalon was minor, converging with olfactory information in the dorsal pallium and area superficialis basalis.
  • Major descending projections from the dorsal pallium targeted the hypothalamus and lateral mesencephalic nucleus; pathways were crossed in Platyrhinoidis but not Squalus.

Conclusions:

  • The dorsal pallium should be reconsidered as a potentially non-olfactory area in elasmobranchs.
  • Multiple telencephalic centers, including the dorsal pallium, are likely involved in olfactory orientation.
  • This study provides new insights into the complex neural circuitry of elasmobranch forebrains.