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Complete Spinal Cord Injury and Brain Dissection Protocol for Subsequent Wholemount In Situ Hybridization in Larval Sea Lamprey

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The Lamprey Forebrain - Evolutionary Implications.

Shreyas M Suryanarayana^1,2, Juan Pérez-Fernández^1,3, Brita Robertson¹

¹Department of Neuroscience, Karolinska Institutet, Solna, Sweden.

Brain, Behavior and Evolution

|June 30, 2021

Summary

This summary is machine-generated.

The lamprey forebrain shares unexpected similarities with mammals, suggesting ancient vertebrate brain evolution. This research reveals conserved structures in the dorsal pallium and basal ganglia, indicating common ancestry.

Keywords:

Basal ganglia Common ancestry Cortex Evolution Forebrain Habenula Lamprey Thalamus Vertebrates

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Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals

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Published on: October 1, 2014

Area of Science:

Neuroscience
Evolutionary Biology
Comparative Anatomy

Background:

The forebrain is crucial for sensory integration and behavioral control in vertebrates.
Understanding forebrain evolution requires comparing diverse vertebrate groups.

Purpose of the Study:

To compare the mammalian forebrain with that of the lamprey, an ancient vertebrate group.
To investigate the evolutionary origins of forebrain structures.

Main Methods:

Review of earlier studies on mammalian and lamprey forebrain.
Comparative analysis of forebrain structures, connectivity, and neurochemistry.

Main Results:

Lamprey dorsal pallium exhibits motor, somatosensory, and visual areas with retinotopic representation.
Remarkable similarities found in basal ganglia organization, connectivity, and molecular components between lampreys and mammals.
Previously, the lamprey pallium was considered primarily olfactory.

Conclusions:

Basic vertebrate forebrain design may have evolved before the divergence of lampreys and mammals.
Proposes a pan-vertebrate schema for forebrain structures, supporting common ancestry over 500 million years ago.