Pre-sympathetic neurones in the rostral ventrolateral medulla of the rat: Electrophysiology, morphology and relationship to adjacent neuronal groups

Janusz Lipski, Refik Kanjhan, Barbara Kruszewska, Weifang F. Rong, Mark Smith

    Research output: Contribution to journalArticle

    20 Scopus citations

    Abstract

    The activity of preganglionic sympathetic neurones largely depends on synaptic excitation from antecendent reticulospinal neurones located in the rostral ventrolateral medulla (RVLM). Our study, conducted in anaesthetized rats, showed that all RVLM pre-sympathetic neurones display a substantial synaptic noise and their action potentials are usually preceded by fast EPSPs. No evidence was found for presence of gradual depolarizations (autodepolarizations) between individual spikes. Therefore our results are consistent with the 'network' hypothesis for the generation of sympathetic vasomotor tone. Axons of some pre-sympathetic neurones intracellularly labelled with Neurobiotin or Lucifer Yellow had collaterals arborizing in several medullary regions. Thus these neurones have synaptic inputs not only to preganglionic sympathetic neurones, but also to other, yet unidentified cells in the brainstem. Finally, our results show that anatomically adjacent RVLM pre-sympathetic and Botzinger respiratory neurones from two functionally distinct neuronal subpopulations, and that some pre-sympathetic neurones have an adrenergic phenotype.

    Original languageEnglish (US)
    Pages (from-to)373-384
    Number of pages12
    JournalActa Neurobiologiae Experimentalis
    Volume56
    Issue number1
    StatePublished - Apr 15 1996

    Keywords

    • brainstem
    • cardiovascular control
    • immunocytochemistry
    • in vivo
    • intracellular recording

    ASJC Scopus subject areas

    • Neuroscience(all)

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