Abstract
SYNAPTIC connections are capable of a remarkable proliferation after nervous tissue has been damaged and some synapses have been destroyed. This proliferation, or ‘sprouting’, of remaining, intact, synapses within partially denervated tissue has been found to occur in the peripheral, autonomic and central nervous systems1–5. As yet, however, the functional ability of these sprouted synaptic contacts has not been extensively tested and the persistence of the sprouted synapses over long periods has not been studied. We have been investigating these problems in the para-sympathetic cardiac ganglion in the frog. Earlier studies have shown that when the nerve supply to the ganglion is partially destroyed by crushing one vagus nerve, axons in the other vagus nerve sprout and synapse with the denervated neurones1. Here I describe experiments in which the persistence of the sprouted synapses in the cardiac ganglion was tested by allowing the damaged axons to regenerate into the tissue. The results indicate that regenerating vagal fibres are able to re-establish some, but not all, of their synaptic connections and that innervation from the sprouted nerve decreases.
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References
Courtney, K., and Roper, S., Nature, 259, 317–319 (1976).
Raisman, G., and Field, P. M., Brain Res., 50, 241–264 (1973).
Lynch, G. S., Matthews, D., Mosko, S., Parks, T., and Cotman, C. W., Brain Res., 42, 311–318 (1972).
Murray, J. G., and Thompson, J. W., J. Physiol., Lond., 135, 133–162 (1957).
Edds, M. V., Jr, Q. Rev. Biol., 28, 260–276 (1953).
McMahan, U. J., and Kuffler, S. W., Proc. R. Soc., B 177, 485–508 (1971).
Purves, D., Nature, 256, 589–590 (1975).
Guth, L., and Bernstein, J. J., Expl Neurol., 4, 59–69 (1961).
Cass, D. T., Sutton, T. J., and Mark, R. F., Nature, 243, 201–203 (1973).
Sotelo, C., and Palay, S. L., Lab. Invest., 25, 653–671 (1971).
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ROPER, S. Sprouting and regeneration of synaptic terminals in the frog cardiac ganglion. Nature 261, 148–149 (1976). https://doi.org/10.1038/261148a0
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DOI: https://doi.org/10.1038/261148a0
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