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Synaptic development in the rabbit superior colliculus and visual cortex

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Summary

The development of synapses in the visual cortex (VC) and superior colliculus (SC) of the rabbit has been examined with the electron microscope. In both areas, the number of synapses reaches adult levels by 20–25 days of postnatal age, but the development in the visual cortex is delayed in comparison to that in the superior colliculus. When S synapses (spheroidal vesicles, asymmetric thickening) are compared with F synapses (flattened vesicles, symmetric thickening), even greater differences are seen. In both the VC and SC, S synapses develop earlier than F synapses, though there is considerable overlap. Of interest is the fact that synapses in the visual cortex seem to overshoot their adult levels late in development, suggesting that an excess of synapses may be formed in this system. Multiple synapses, probably of retinal origin, increase in the first 3 weeks of synaptic development in the SC, but never are present in significant proportions in the VC.

Synapse formation most often is characterized by formation of a junction and a postsynaptic thickening, followed by acquisition of synaptic vesicles. After 15 days, there is only a small number of such “non-vesicle synapses” in either the SC or VC.

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Authors and Affiliations

  1. Department of Structural Biology, Fairchild Research Center, School of Medicine, Stanford University Medical Center, 94305, Stanford, CA, USA

    L. H. Mathers Jr., K. L. Mercer & P. E. Marshall

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  1. L. H. Mathers Jr.
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  2. K. L. Mercer
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  3. P. E. Marshall
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Mathers, L.H., Mercer, K.L. & Marshall, P.E. Synaptic development in the rabbit superior colliculus and visual cortex. Exp. Brain Res. 33, 353–369 (1978). https://doi.org/10.1007/BF00235559

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