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Interactions between spinal interneurons and ventral spinocerebellar tract neurons.

Artikel i vetenskaplig tidskrift
Författare Elzbieta Jankowska
Ingela Hammar
Publicerad i The Journal of physiology
Volym 591
Nummer/häfte Pt 22
Sidor 5445-5451
ISSN 1469-7793
Publiceringsår 2013
Publicerad vid Institutionen för neurovetenskap och fysiologi, sektionen för fysiologi
Sidor 5445-5451
Språk en
Länkar dx.doi.org/10.1113/jphysiol.2012.24...
https://gup.ub.gu.se/file/140930
Ämnesord Interneurone, Motor systems, Spinal cord
Ämneskategorier Medicinska grundvetenskaper, Neurofysiologi

Sammanfattning

Recent evidence indicates that ventral spinocerebellar tract (VSCT) neurons not merely receive information provided by spinal interneurons but may also modulate the activity of these interneurons. Hence, interactions between them may be mutual. However, while it is well established that spinal interneurons may provide both excitatory and inhibitory input to ascending tract neurons, the functional consequences of the almost exclusively inhibitory input from premotor interneurons to subpopulations of VSCT neurons were only recently addressed. These are discussed in the first part of this review. The second part of the review summarizes evidence that some VSCT neurons may operate both as projection neurons and as spinal interneurons and play a role in spinal circuitry. It outlines the evidence that initial axon collaterals of VSCT neurons target premotor inhibitory interneurons in disynaptic reflex pathways from tendon organs and muscle spindles (group Ia, Ib and/or II muscle afferents) to motoneurons. By activating these interneurons VSCT neurons may evoke disynaptic IPSPs in motoneurons and thus facilitate inhibitory actions of contralateral muscle afferents on motoneurons. In this way they may contribute to the coordination between neuronal networks on both sides of the spinal cord in advance of modulatory actions evoked via the cerebellar control systems.

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