ISSN:
1432-2013
Keywords:
Vago-Vagal Reflex Arc
;
Bilateral Symmetric Interaction
;
Reciprocal Innervation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary Discharges of single neurons in the nuclei of the cat's laryngeal nerves were recorded extracellularly with microelectrodes during electrical stimulation of the laryngeal nerves, which were severed close to the larynx. Stimulation of the superior laryngeal nerve evoked discharges of neurons 1. in the dorsal part of the (sensory) nucleus tractus solitarii with a short latency (mean 2.6 msec), only a few spikes per stimulus and slight variability 2. in the ventral part with longer latency (mean 9.2 msec), with a maximum of 10 spikes and great variability 3. in the (motor) nucleus ambiguus with the longest latency (mean 10.36 msec). During stimulation of the laryngeal branch of the recurrent nerve in the nucleus tractus solitarii responses with a mean latency of 12.72 msec were registrated. Single potentials evoked by recurrent nerve stimulation in both vagal nuclei could be completely inhibited by preceding stimuli of the superior laryngeal nerve but not vice versa. Inspiration-coupled “spontaneous” activity in the nucleus tractus solitarii was inhibited during and after stimulation (up to 200 msec) of the superior laryngeal nerve only. During this inhibition the inspiration's depth and frequency decreased. The results demonstrate some properties of the central connection of the vagal nuclei.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00586845
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