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• W2053207942 abstract "We have quantitatively investigated the postnatal development of synaptic contacts in the visual cortex of rabbits and the effects of long-term dark-rearing on this development. The synaptic contacts are visualized in full en face extension using 0.5 μm sections of E-PTA treated tissue21. In early postnatal life the mean size and the size distribution of the synaptic grids are much the same as in adult rabbits. Only minor changes are observed. The variations in size distribution at different levels below the pial surface, characteristic for the adult animal21, are also present in early postnatal life. Prior to eye opening many synaptic grids lack dense projections or are only partly covered. After eye opening the dense projections mature but are still different from the adult grids at postnatal days 21–27. The number of complex grids, annulate or horseshoe-shaped, gradually increases and is above adult level at days 21–27. Dark-rearing has no effect on size and size distribution of the synaptic grids and does not affect the frequency of complex grids. Careful observation reveals, however, that the dense projections do not develop normally. They remain small and fuzzy as in the visual cortex of young rabbits, and many grids are only partly covered. These observations demonstrate that the synaptic contacts are to a great extent genetically predetermined. They are also formed with a specific size which does not change during development and is not affected by dark-rearing. The gradual maturation of the dense projections and the retardation of their development during dark-rearing indicates that visual experience interferes with the development of these synaptic substructures. Because of the complementarity of dense projections and vesicle attachment sites the maturation of dense projections and the effect of dark-rearing can be interpreted as change in the efficacy of synaptic transmission." @default.
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• W2053207942 date "1981-01-01" @default.
• W2053207942 modified "2023-10-16" @default.
• W2053207942 title "The postnatal development of the presynaptic grid in the visual cortex of rabbits and the effect of dark-rearing" @default.
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• W2053207942 doi "https://doi.org/10.1016/0006-8993(81)90718-6" @default.
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