Differential control of sympathetic activity to kidney and skeletal muscle by ventral medullary neurons
| Autor: | F. A. Hopp, Jeanne L. Seagard, John P. Kampine, Caron Dean |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Sympathetic Nervous System
Physiology Central nervous system Blood Pressure Biology Baroreflex Kidney Stereotaxic Techniques medicine Animals Homocysteine Medulla Medulla Oblongata Muscles General Neuroscience food and beverages Skeletal muscle Rostral ventrolateral medulla Anatomy Hindlimb Electrophysiology medicine.anatomical_structure Peripheral nervous system Cats Medulla oblongata Neurology (clinical) |
| Zdroj: | Journal of the Autonomic Nervous System. 37:1-10 |
| ISSN: | 0165-1838 |
| DOI: | 10.1016/0165-1838(92)90139-8 |
| Popis: | A rise in arterial blood pressure can be evoked by microinjections of d,l -homocysteic acid into localized regions of the ventrolateral medulla of the cat. Three patterns of sympathetic discharge can be identified during the pressor response. A differential pattern consisting of an increase in renal nerve activity and no change in sympathetic activity to skeletal muscle vasculature can be elicited from sites ventromedial to the caudal pole of the facial nucleus. From more lateral and caudal sites, a generalized sympatho-excitation is evoked in the outflow to both the kidney and hindlimb muscle vasculature. A third response consisting of a differential increase in muscle sympathetic activity simultaneous with a small decrease in renal nerve activity could be evoked from caudal sites, lateral to the inferior olives and superficial to the ventral surface. The results show that ventral medullary neurons can selectively activate sympathetic outflow to control specific vascular beds. These data may support the hypothesis that the ventrolateral medulla contains discrete groups of topographically arranged neurons that can differentially control sympathetic tone to various end-organs. |
| Databáze: | OpenAIRE |
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