Effect of Light Deprivation on Fine Structural Changes in the Optic Tectum of the Rainbow Trout (Salmo gairdneri, Rich.) during Ontogenesis
- 1 January 1979
- journal article
- research article
- Published by S. Karger AG in Developmental Neuroscience
- Vol. 2 (1) , 19-24
- https://doi.org/10.1159/000112435
Abstract
The morphogenetic differentiation of synapses in the optic tectum of dark- and light-reared rainbow trout was investigated at different critical stages of development. The total lack of any light stimulus during the main period of synaptogenesis (first month after hatching) caused a considerable reduction in the number of synapses per unit area as well as in the length of synaptic contact zones. Moreover, a significant decrease (approximately 25%) in the number of synaptic vesicles per nerve terminal was found. This decrease proved to be absolute, insofar as the extensions of the synaptic bulbs remained unchanged at the same time.Keywords
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