A comparison of the ultrastructure of synapses in the cerebello-rubral and cerebello-thalamic pathways in the rat

The aim of this study was to compare the ultrastructure of anterogradely labelled cerebellar terminals in the red nucleus (RN), ventrolateral (VL), parafascicular (PF) and central medial (CM) thalamic nuclei, as well as in the zona incerta (ZI). No differences were found in the morphology of synapse...

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Bibliographic Details
Published in:Neuroscience letters 1996-06, Vol.211 (3), p.175-178
Main Authors: Aumann, Timothy Douglas, Horne, Malcom Kenneth
Format: Article
Language:English
Subjects:
Anatomy
Animals
Biological and medical sciences
Central nervous system
Cerebello-rubral
Cerebello-thalamic
Cerebellum - ultrastructure
Electron microscopy
Fundamental and applied biological sciences. Psychology
Male
Microscopy, Electron
Neural Pathways - ultrastructure
Rat
Rats
Rats, Sprague-Dawley
Synapses
Synapses - ultrastructure
Thalamus - ultrastructure
Vertebrates: nervous system and sense organs
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Summary:The aim of this study was to compare the ultrastructure of anterogradely labelled cerebellar terminals in the red nucleus (RN), ventrolateral (VL), parafascicular (PF) and central medial (CM) thalamic nuclei, as well as in the zona incerta (ZI). No differences were found in the morphology of synapses in any of the nuclei. Terminals in RN and VL were larger than those in PF, CM and ZI and synapsed proximally. In contrast, synapses in PF, CM and ZI formed mainly on distal dendrites. These findings indicate that cerebellar output neurones (a) form morphologically similar synapses (Gray's type I) on neurones in functionally different nuclei, and (b) form larger, more proximal synapses in RN and VL than in PF, CM and ZI.
ISSN:0304-3940
1872-7972
DOI:10.1016/0304-3940(96)12757-9