Trajectories of regenerating retinal axons in the goldfish tectum (II) : exploratory branches and growth cones on axons at early regeneration stages

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1988
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Journal of Comparative Neurology. 1988, 267(1), pp. 69-91. ISSN 0021-9967. eISSN 1096-9861. Available under: doi: 10.1002/cne.902670106
Zusammenfassung

HRP was applied to small sites in the dorsotemporal or dorsonasal retina in fish at 10-36 days after optic nerve section. The anterogradely labeled axons were visualized in tectal whole mounts.
Axons traveled through all regions of the tectum in various abnormal routes. Misrouted axons were also seen to alter their orientation and to direct their course toward their target. At all regeneration stages the majority of dorsotemporal axons coursed and achieved target-related orientations preferentially within the rostral tectal half whereas dorsonasal axons proceeded into the caudal tectum.
The growing axons exhibited various morphologies. All axons in the superficial fascicle layer stratum opticum (SO) and some in the synaptic layer stratum fibrosum et griseum superficiale (SFGS) were unbranched and tipped with a leading growth cone. Other axons in the synaptic layer carried one to several growth cones at their ends and often filopodia proximal to the growth cone, or they had sprouted numerous side branches with growth cones and filopodia on the shaft and on branches. Some axons at retinotopic or ectopic sites gave rise to several long branches of several hundred microns in length, with growth cones and filopodia. From 32 days onward axons ending in terminal arbors at retinotopic sites became apparent. Thus, numerous axons at early regeneration stages go through a phase of exploratory growth on their way toward their target sites.

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570 Biowissenschaften, Biologie
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regenerating retinotectal axons, abnormal paths, anterograde HRP staining, tectal whole mounts
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ISO 690STÜRMER, Claudia, 1988. Trajectories of regenerating retinal axons in the goldfish tectum (II) : exploratory branches and growth cones on axons at early regeneration stages. In: Journal of Comparative Neurology. 1988, 267(1), pp. 69-91. ISSN 0021-9967. eISSN 1096-9861. Available under: doi: 10.1002/cne.902670106
BibTex
@article{Sturmer1988Traje-7153,
  year={1988},
  doi={10.1002/cne.902670106},
  title={Trajectories of regenerating retinal axons in the goldfish tectum (II) : exploratory branches and growth cones on axons at early regeneration stages},
  number={1},
  volume={267},
  issn={0021-9967},
  journal={Journal of Comparative Neurology},
  pages={69--91},
  author={Stürmer, Claudia}
}
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