Retinofugal and retinopetal connections in the upside-down catfish (synodontis nigriventris)

The retinofugal and retinopetal connections in the upside-down catfish Synodontis nigriventris were studied by use of the horseradish-peroxidase (HRP) techniques, autoradiography, and degeneration-silver methods. An unusual retinal projection to the torus semicircularis as well as projections to the...

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Bibliographic Details
Published in:Cell and tissue research 1981-01, Vol.218 (2), p.389-401
Main Authors: Meyer, D L, Ebbesson, S O
Format: Article
Language:English
Subjects:
Animals
Fishes - anatomy & histology
Horseradish Peroxidase
Hypothalamus - anatomy & histology
Nerve Degeneration
Retina - anatomy & histology
Superior Colliculi - ultrastructure
Thalamus - anatomy & histology
Visual Pathways - anatomy & histology
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Summary:The retinofugal and retinopetal connections in the upside-down catfish Synodontis nigriventris were studied by use of the horseradish-peroxidase (HRP) techniques, autoradiography, and degeneration-silver methods. An unusual retinal projection to the torus semicircularis as well as projections to the retina from three different sources in the brain are described. After intra-ocular injections of HRP, labeled cells were found in the optic tectum, the dorsomedial optic nucleus and one of the pretectal nuclei. These new findings support the basic hypothesis (i) that neuronal connections are more extensive in primitive brains, and (ii) that the evolutionary development of more complex brains involves the loss of some selected connections.
ISSN:0302-766X
1432-0878
DOI:10.1007/BF00210352