Control of phrenic nerve activity and blood pressure by the medullary raphe nuclei in cats.

C. T. Yen, J. C. Hwang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Electrical and chemical stimulation methods were used to determine the topographic organization of the medullary raphe nuclei (MRN) in controlling the systemic arterial blood pressure (BP) and phrenic nerve activities (PNA). Decerebrated, unanesthetized and bilateral vagotomized cats were used. Effective points in the MRN were systematically explored with constant current stimulation. We found stimulation of the rostral MRN produced a decrease in PNA amplitude and increase in BP and PNA frequency. Stimulation of the caudal MRN produced increases in BP and the amplitude and frequency of PNA. Microinjection of glutamate solution into the caudal or the rostral MRN points produced qualitatively similar results. Thus, we concluded that the caudal MRN neurons had excitatory connections whereas the rostral MRN neurons had excitatory and inhibitory connections to the cardiovascular preganglionic neurons and the phrenic nerve motoneurons.

Original languageEnglish
Pages (from-to)89-96
Number of pages8
JournalProceedings of the National Science Council, Republic of China. Part B, Life sciences
Volume13
Issue number2
Publication statusPublished - 1989 Apr

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Phrenic Nerve
Raphe Nuclei
Cats
Blood Pressure
Neurons
Chemical Stimulation
Microinjections
Motor Neurons
Electric Stimulation
Glutamic Acid
Arterial Pressure
Midbrain Raphe Nuclei

ASJC Scopus subject areas

  • Medicine(all)

Cite this

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abstract = "Electrical and chemical stimulation methods were used to determine the topographic organization of the medullary raphe nuclei (MRN) in controlling the systemic arterial blood pressure (BP) and phrenic nerve activities (PNA). Decerebrated, unanesthetized and bilateral vagotomized cats were used. Effective points in the MRN were systematically explored with constant current stimulation. We found stimulation of the rostral MRN produced a decrease in PNA amplitude and increase in BP and PNA frequency. Stimulation of the caudal MRN produced increases in BP and the amplitude and frequency of PNA. Microinjection of glutamate solution into the caudal or the rostral MRN points produced qualitatively similar results. Thus, we concluded that the caudal MRN neurons had excitatory connections whereas the rostral MRN neurons had excitatory and inhibitory connections to the cardiovascular preganglionic neurons and the phrenic nerve motoneurons.",
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