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Axon order in the visual pathway of the quokka wallaby

Axon order in the visual pathway of the quokka wallaby Axon order throughout the visual pathway of the quokka wallaby (Setonix brachyurus) was determined after localised retinal applications of the tracers DiI and/or DiASP. Postnatal days (P) 22–90 were studied to encompass the development and refinement of retinal projections. Order was essentially similar at all stages. Axons entered the optic nerve head true to their sector of retinal origin. In the optic nerve, nasal and temporal axons continued to reflect their retinal origin, dominating, respectively, the medial and lateral halves. By contrast, dorsal and ventral axons exchanged locations between the retrobulbar level and one‐third the distance along the nerve; thus, the inversion of the dorsoventral retinal axis, imposed by the lens, was corrected. Decussating axons maintained their relative locations through the chiasm. At the base of the optic tract, nasal and temporal axons underwent an axial rotation to lie on the medial and lateral sides, respectively; thus nasal overlapped with ventral axons and temporal with dorsal axons. Axons maintained their alignments throughout the tract, and as a result, nasal and ventral axons invaded the superior colliculus medially, whereas temporal and dorsal axons invaded laterally. Each retinal quadrant terminated preferentially in its retinotopically appropriate sector of the colliculus. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Comparative Neurology Wiley

Axon order in the visual pathway of the quokka wallaby

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References (86)

Publisher
Wiley
Copyright
"Copyright © 1998 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
0021-9967
eISSN
1096-9861
DOI
10.1002/(SICI)1096-9861(19980119)390:3<333::AID-CNE3>3.0.CO;2-2
Publisher site
See Article on Publisher Site

Abstract

Axon order throughout the visual pathway of the quokka wallaby (Setonix brachyurus) was determined after localised retinal applications of the tracers DiI and/or DiASP. Postnatal days (P) 22–90 were studied to encompass the development and refinement of retinal projections. Order was essentially similar at all stages. Axons entered the optic nerve head true to their sector of retinal origin. In the optic nerve, nasal and temporal axons continued to reflect their retinal origin, dominating, respectively, the medial and lateral halves. By contrast, dorsal and ventral axons exchanged locations between the retrobulbar level and one‐third the distance along the nerve; thus, the inversion of the dorsoventral retinal axis, imposed by the lens, was corrected. Decussating axons maintained their relative locations through the chiasm. At the base of the optic tract, nasal and temporal axons underwent an axial rotation to lie on the medial and lateral sides, respectively; thus nasal overlapped with ventral axons and temporal with dorsal axons. Axons maintained their alignments throughout the tract, and as a result, nasal and ventral axons invaded the superior colliculus medially, whereas temporal and dorsal axons invaded laterally. Each retinal quadrant terminated preferentially in its retinotopically appropriate sector of the colliculus.

Journal

The Journal of Comparative Neurology – Wiley

Published: Jul 19, 1999

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