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Interactions between baroreceptor and sympathetic pathways.

R B McCall, S J Humphrey

The American Journal of Physiology

|April 1, 1983

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Baroreceptor nerve stimulation inhibits sympathetic nervous discharge (SND) via distinct brainstem pathways. These pathways modulate SND amplitude and cardiac timing, with a spinal component also identified.

Area of Science:

Neuroscience
Cardiovascular Physiology

Background:

Baroreceptors are crucial for regulating blood pressure.
Sympathetic nervous discharge (SND) plays a key role in cardiovascular control.
Understanding the interplay between baroreceptor reflexes and sympathetic outflow is vital for cardiovascular health.

Purpose of the Study:

To investigate the interaction between baroreceptor afferent pathways and sympathetic nervous discharge (SND).
To elucidate the mechanisms underlying baroreceptor-induced sympathoinhibition.
To differentiate central and spinal components of baroreceptor reflex control.

Main Methods:

Anesthetized cats were used to study baroreceptor-sympathetic interactions.
Computer summation techniques were employed to analyze neural discharge patterns.

Related Experiment Videos

Electrical stimulation of baroreceptor afferent nerves was performed.

Sympathetic nervous discharge was recorded from the external carotid and inferior cardiac nerves.

Pharmacological agents like picrotoxin were used to probe neural mechanisms.

Main Results:

Baroreceptor stimulation induced early and late periods of sympathetic inhibition.
The late inhibition phase summated algebraically with cardiac-locked SND.
Stimulation intensity correlated with late inhibition amplitude and duration.
Picrotoxin selectively blocked late inhibition while enhancing cardiac locking of SND.
Distinct central pathways in the brainstem mediate amplitude modulation and temporal locking.

Conclusions:

The late phase of baroreceptor-induced inhibition modulates sympathetic outflow amplitude independently of its timing.
Central baroreceptor pathways for amplitude modulation and cardiac temporal locking are distinct.
These distinct pathways are located within the brainstem.
A spinal component contributing to baroreceptor-induced sympathoinhibition exists.