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The reticular formation of the lower brain stem contains neuronal circuits for the generation of sympathetic tone, respiratory rhythm, muscle tone and the control of vigilance. In anesthetized dogs single neurone activities were recorded in the medial two-thirds of the reticular formation to investigate the organizing principles of this multifunctional(More)
This paper is comprised of a review of past contributions and their theoretical consequences and a presentation of new results in studies of the origin of sympathetic rhythms and tone. Two basic mechanisms are involved: a primary intracentral coupling with the main cardiovascular-respiratory rhythm (MCRR) generator and a secondary reflex coupling. It was(More)
The resistance to flow was measured with high sensitivity in an isolated skin area of dogs. Constrictions of the vessels were induced by stimulation of the skin nerve. 1. The shortest latency measured between a single stimulus and the beginning of the constriction was 230 msec. 2. By a single stimulus or by a short burst of stimuli constrictions were(More)
Experiments were carried out on cats anaesthetized with chloralose-urethane with a view to defining certain central pathways for the J reflex elicited by the right atrial injection of phenyldiguanide. The resulting motor inhibition was manifested by reduction in the amplitude of the knee jerk. The dorsal surface of the medulla was exposed and free riding(More)
Untersuchungen fiber die nervSse Kreislattfsteuerung oder ihre Teilsysteme pflegea yon einem der beiden folgende~ Gesichtspunkte ~uszugehen : 1. Betrachtung der Kreislaufeigenreflexe, in deren Mittelpunkt die Untersuchung der Funktion der Pressoreceptoren steht. Dieser Ansatz ffihrte zur Betrachtung des Systems als homoiostatischem Mechanismus, unter den(More)
Bei willkürlicher Variation der Atemfrequenz und bei willkürlicher Apnoe wurde beim ruhig sitzenden Menschen der Patellarsehnenreflex kontinuierlich ausgelöst. Bei willkürlicher Apnoe konnten vorher atemsynchrone Schwankungen der elektromyographisch registrierten Reflexamplituden im vorherigen Atemrhythmus weiterlaufen. Während Taktatmung mit(More)
Several types of respiratory reflex actions can be discerned according to the reactions of typical respiratory neurons in the efferent part of the central rhythmogenic structure. Whereas respiration runs closely parallel with inspiratory neuron activity the behaviour of expiratory neurons cannot be derived from the resulting reflex changes of respiration.(More)