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Organization of retinal ganglion cell axons in the optic fiber layer and nerve of fetal ferrets

Published online by Cambridge University Press:  02 June 2009

T. Fitzgibbon  and
B. E. Reese
T. Fitzgibbon
Affiliation:
Department of Clinical Ophthalmology, University of Sydney, NSW, Australia
B. E. Reese
Affiliation:
Neuroscience Research Institute and Department of Psychology, University of California at Santa Barbara
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Abstract

Previous authors have hypothesized that retinotopic projections may be influenced by ‘preordering’ of the axons as they grow towards their targets. In some nonmammalian species, axons are reorganized at or near the optic nerve head to establish a retinotopic order. Data are ambiguous concerning the retinotopy of the mammalian retinal nerve fiber layer and whether fibers become reorganized at the optic nerve head. We have examined this question in fetal and newborn ferrets (Mustela putorius furo) by comparing the arrangement of axons in the retinal nerve fiber layer with that in the optic nerve. Dil or DiA crystals were implanted into fixed tissue in the innermost layers of the retinal periphery, or at a location midway between the periphery and the optic nerve head. Fluorescence labelling was examined in 100–200 μm Vibratome sections, or the eyecup and nerve were photooxidized and 1–2 μm longitudinal or transverse sections were examined. Regardless of fetal age, eccentricity or quadrant of the implant site, a segregation of labelled peripheral axons from unlabelled central ones was not detected within the nerve fiber layer. Axons coursed into the nerve head along the margin of their retinal quadrant of origin, often entering the optic nerve as a radial wedge, thus preserving a rough map of retinal circumference. However, peripheral axons were in no way restricted to the peripheral (nor central) portions of the nerve head or nerve, indicating that the optic axons do not establish a map of retinal eccentricity. Our results demonstrate that (1) the nerve fiber layer is retinotopic only with respect to circumferential position and (2) optic axons are not actively reorganized to establish a retinotopic ordering at the nerve head. The present results suggest that any degree of order present within the optic nerve is a passive consequence of combining the fascicles of the retinal nerve fiber layer; optic axons are not instructed to establish, nor constrained to maintain, a retinotopic order within the optic nerve.

Keywords

RetinotopyChronotopyOptic nerve headOptic chiasm
Type
Research Articles
Information
Visual Neuroscience , Volume 13 , Issue 5 , September 1996 , pp. 847 - 861
Copyright
Copyright © Cambridge University Press 1996

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