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Brain stem area with C1 epinephrine neurons mediates baroreflex vasodepressor responses

Brain stem area with C1 epinephrine neurons mediates baroreflex vasodepressor responses DONG H. PARK, Medical College, New York, New York of the Cr group of Hokfelt (34) can only be precisely defined immunocytochemically with antibodies to the epinephrine-synthesizing enzyme phenylethanolamine-N-methyltransferase (PNMT). These epinephrine of the C1 group project to the spinal cord wherein they selectively innervate autonomic of the intermediomedial intermediolateral columns (58, 59). We have termed the cardiovascular responsive area of the RVL containing PNMT the have proposed that in this subregion, possibly the adrenergic cells, represent the source of tonic background drive to sympathetic hence are responsible for maintenance of resting levels of AP (56,58, 60) The present study seeks to establish whether this region of RVL also mediates the vasodepressor to stimulation of arterial baroreceptors afferent fibers of the vagus nerve, most of which arise from cardiopulmonary receptors (75). That this region may subserve this function is suggested by two observations. First, the RVL, in particular the , is heavily innervated by projections from a division of nucleus tractus solitarii (NTS) (22, 26,64, 66), corresponding to a site of termination of afferent fibers of the aortic baroreceptor reflex; rostra1 ventrolateral medulla; vagal stimudepressor carotid sinus nerves the first site of lation; bd pressure integration of baroreceptor http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Heart and Circulatory Physiology The American Physiological Society

Brain stem area with C1 epinephrine neurons mediates baroreflex vasodepressor responses

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Publisher
The American Physiological Society
Copyright
Copyright © 1985 the American Physiological Society
ISSN
0363-6135
eISSN
1522-1539
Publisher site
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Abstract

DONG H. PARK, Medical College, New York, New York of the Cr group of Hokfelt (34) can only be precisely defined immunocytochemically with antibodies to the epinephrine-synthesizing enzyme phenylethanolamine-N-methyltransferase (PNMT). These epinephrine of the C1 group project to the spinal cord wherein they selectively innervate autonomic of the intermediomedial intermediolateral columns (58, 59). We have termed the cardiovascular responsive area of the RVL containing PNMT the have proposed that in this subregion, possibly the adrenergic cells, represent the source of tonic background drive to sympathetic hence are responsible for maintenance of resting levels of AP (56,58, 60) The present study seeks to establish whether this region of RVL also mediates the vasodepressor to stimulation of arterial baroreceptors afferent fibers of the vagus nerve, most of which arise from cardiopulmonary receptors (75). That this region may subserve this function is suggested by two observations. First, the RVL, in particular the , is heavily innervated by projections from a division of nucleus tractus solitarii (NTS) (22, 26,64, 66), corresponding to a site of termination of afferent fibers of the aortic baroreceptor reflex; rostra1 ventrolateral medulla; vagal stimudepressor carotid sinus nerves the first site of lation; bd pressure integration of baroreceptor

Journal

AJP - Heart and Circulatory Physiology – The American Physiological Society

Published: Apr 1, 1985

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