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Related Experiment Videos

Axonal redirection at the dorsoventral intraretinal boundary.

A D Springer1, K D Morel, S L Grobman

  • 1Department of Cell Biology and Anatomy, New York Medical College, Valhalla 10595.

The Journal of Comparative Neurology
|May 15, 1989
PubMed
Summary

A specific molecular factor at the retinal border guides retinal ganglion cell (RGC) axons. This guidance prevents ventral RGC axons from mixing with dorsal RGC axons, maintaining retinal organization.

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Area of Science:

  • Neuroscience
  • Retinal Cell Biology
  • Axonal Guidance

Background:

  • Retinal ganglion cells (RGCs) are crucial for visual processing.
  • Understanding axonal pathfinding in the retina is key to neural development.

Purpose of the Study:

  • To investigate the trajectory of specific RGC axons in goldfish.
  • To identify factors influencing axonal pathfinding at the retinal border.

Main Methods:

  • Cobaltous-lysine backfilling of goldfish retinal ganglion cells and axons.
  • Digitization of axonal bending points and retinal boundaries.
  • Control studies to differentiate RGCs from retinopetal cells.

Main Results:

  • A subpopulation of RGC axons followed a circumferential path along the ventronasal and ventrotemporal retinal margin.

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  • Axons arched dorsally at the dorsoventral retinal boundary, approximately 100 microns from the border.
  • Soma size of these RGCs was average, with some slight displacement toward the inner plexiform layer.

    • Conclusions:

    • A molecular cue, not mechanical force, at the retinal border likely alters axonal trajectory.
    • Ventral RGC axons appear to avoid mingling with dorsal RGC axons.
    • This suggests a mechanism for maintaining segregation of axonal projections within the optic nerve.