Circulatory reflexes in spinal man

Circulatory reflexes from carotid and extracarotid baroreceptor areas in man.

The carotid sinus baroreceptor reflex was studied in 11 normotensive subjects, using a variable pressure neck chamber and correcting for imperfect pressure transmission to the carotid sinus. Decreased carotid baroreceptor stimulation caused a sustaineded rise in arterial pressure, and increased carotid baroreceptor stimulation caused a sustain fall. The responses were in linear relation to the ...

Activation of carotid baroreceptors inhibits spinal reflexes in man.

The present study was designed to investigate the effect of baroreceptors on a spinal reflex. The Achilles tendon reflex (T reflex), a monosynaptic spinal reflex, was chosen as an indicator of descending influences of central activation. The baroreceptors are stretch receptors which respond to extensions of the arterial wall. Carotid sinus baroreceptors can be manipulated non-invasively by mean...

Circulatory Reflexes from Mechanoreceptors

• More is known about the baroreflex of the carotid sinus than about the baroreflexes originating from the heart and the great vessels because of the easy surgical preparation of the carotid sinus area. The "isolated innervated sinus preparation" introduced by Moissejeff in 1926 and its various modifications have provided a convenient method for studying the carotid sinus reflex (1). The presen...

Micturition reflexes in man.

Spinal sympathetic cardiocardiac reflexes.

We studied the reflex changes in myocardial contractility elicited by electrical stimulation of afferent cardiac sympathetic nerve fibers or chemical stimulation of their cardiac endings. Veratridine injected directly into the left coronary artery was the chemical stimulus. The maximum rate of rise of left ventricular pressure, dP/dt max, was used as an index of myocardial contractility. The st...