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Related Experiment Videos

Fiber order in the opossum's optic tract.

L A Cavalcante1, S Allodi, B E Reese

  • 1Departamento de Neurobiologia, Universidade Federal do Rio de Janeiro, Brasil.

Anatomy and Embryology
|December 1, 1992
PubMed
Summary

The South American opossum

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Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Mammalian Visual System

Background:

  • The optic tract's organization is crucial for visual processing.
  • Axon size distribution varies across mammalian species.
  • Understanding opossum visual pathways offers insights into mammalian evolution.

Purpose of the Study:

  • To investigate the distribution of axons by size in the opossum's optic tract.
  • To determine how axon size relates to crossed and uncrossed visual pathways.
  • To compare opossum optic tract organization with other mammals.

Main Methods:

  • Examination of thin and semi-thin sections of optic tracts.
  • Measurement of axonal diameters using electron micrographs.
  • Analysis of optic tracts from normal and enucleated opossums.

Main Results:

  • Axons in the opossum optic tract are partially segregated by size.
  • Fine axons are concentrated in deeper regions, coarse axons superficially.
  • Both crossed and uncrossed pathways contain medium and coarse axons; uncrossed are superficial.
  • Fine axons in deeper regions originate from both retinae; superficial fine axons are mostly crossed.

Conclusions:

  • Opossum optic tract organization mirrors that of placental mammals, particularly carnivores.
  • This similarity suggests early evolution of parallel visual pathways in mammals.
  • A conserved developmental mechanism likely underlies this common organizational plan.

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