Chemoreception pp 461-466 | Cite as

Peripheral Chemoreceptor Input to Cardiac Vagal Preganglionic Neurones in the Anaesthetised Rat

  • Deirdre M. O’Leary
  • James F. X. Jones
Conference paper
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 536)


There is anatomical evidence that there are two main populations of preganglionic neurones that project to the cardiac vagal branch in several species including rat, cat and dog. One population originates in the ventrolateral nucleus ambiguus (NA), and comprises neurones with small myelinated axons (B-fibres) (McAllen and Spyer, 1978). The other group originates in the dorsal vagal motor nucleus (DVMN) and comprises mainly of slowly conducting, unmyelinated axons (C- fibres) (Fordet al.,1990). The B-fibre group has been shown to display a powerful respiratory-related component to their activity (McAllen and Spyer, 1978), whereas it has been reported that the majority of C-fibre vagal efferents located in the DVMN show no modulation in phase with respiration (Joneset al.,1998).


Conduction Velocity Nucleus Ambiguus Preganglionic Neurone Blood Pressure Signal Cardiac Unit 
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Copyright information

© Springer Science+Business Media New York 2003

Authors and Affiliations

  • Deirdre M. O’Leary
  • James F. X. Jones
    • 1
  1. 1.Department of Human Anatomy and PhysiologyUniversity College DubinDublinIrleand

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