The development of ipsilateral retinal projections into the tectum in the cichlid fish Haplochromis burtoni: a Dil study in fixed tissue.
The normal development of the retinal projection was studied in a bony fish with Dil. Between 5.5 and 10 days postfertilization the contralateral retinal projection grows from the rostral pole of the tectum across its center. A maximum of 15 retinal fibers reaches the ipsilateral tectum. In 33-day-old juvenile animals, less than 15 ipsilateral fibers terminate in the entire tectum. Ipsilaterally projecting ganglion cells (maximal number = 20 cells) are scattered throughout the entire retina, and the location of ganglion cells in the retina and axonal terminations in the tectum display a large interindividual variability. This suggests that the small adult contingent of ipsilateral fibers in this bony fish develops without an initial exuberant ipsilateral retinal projection that is later pruned back.
Fritzsch
B
B
Faculty of Biology, University of Bielefeld, Germany.
Wilm
C
C
D000818:Animals; D001369:Axons / Q000502:physiology; D002232:Carbocyanines; D006651:Histocytochemistry; D006735:Horseradish Peroxidase; D007814:Larva / Q000502:physiology; D009900:Optic Nerve / Q000166:cytology / Q000502:physiology; D010471:Perches / Q000502:physiology*; D012160:Retina / Q000166:cytology / Q000502:physiology*; D012165:Retinal Ganglion Cells / Q000502:physiology; D013477:Superior Colliculi / Q000166:cytology / Q000502:physiology*; D014795:Visual Pathways / Q000166:cytology / Q000502:physiology*
D002232:Carbocyanines; C024286:3,3'-dioctadecylindocarbocyanine; D006735:Horseradish Peroxidase