The synaptic terminations of certain midbrain-olivary fibers in the opossum

The Journal of Comparative Neurology
J S KingB E Maley

Abstract

The nuclear origin and distribution of midbrain-olivary fibers has been described in a previous study utilizing axonal transport techniques (Linauts and Martin, '78a). The present report extends their results to the electron microscopic level and details the postsynaptic distribution of such fibers. Lesions within the ventral periaqueductal grey and adjacent tegmentum, the red nucleus or the nucleus subparafascicularis result in electron dense axon terminals within the olive at survival times of 48, 72 and 96 hours. At 72 hours, many degenerating presynaptic profiles shrink, become irregular in shape and are totally or partially surrounded by glial processes. The principal olivary nucleus contains the majority of these profiles. However, the subparafascicular terminals are more abundant in the rostral and intermediate parts of the medial accessory nucleus and the rubral terminals are concentrated within the dorsal lamella of the principal nucleus. The nuclear location of the degenerating terminals was determined by examination of 1 micrometer plastic sections cut in the transverse plane from each block face prior to thin sectioning. Degenerating terminals were counted in three cases, one from each of the three lesion sites desc...Continue Reading

References

Dec 15, 1976·The Journal of Comparative Neurology·D L TolbertP A Young
May 15, 1978·The Journal of Comparative Neurology·W W BlessingP R Howe
Sep 15, 1975·The Journal of Comparative Neurology·J R Sladek, J P Bowman
Aug 1, 1977·The Journal of Comparative Neurology·D G GwynB A Flumerfelt
Sep 24, 1976·Experimental Brain Research·J S KingG F Martin
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Jan 1, 1975·Experimental Brain Research·J S KingM H Bowman
Feb 1, 1976·The Journal of Comparative Neurology·J S King
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Apr 15, 1973·The Journal of Comparative Neurology·M H Bowman, J S King
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May 1, 1974·Journal of Neurophysiology·R LlinasC Sotelo
May 1, 1978·The Journal of Comparative Neurology·K A Crutcher, A O Humbertson

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Citations

Aug 24, 1979·Brain Research·N H BarmackV E Pettorossi
Jan 1, 1980·The Journal of Comparative Neurology·J G Rutherford, D G Gwyn

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