Cardiovascular Physiology —
Nervous Regulation of the Circulation

Autonomic nervous system

control of cardiac function

sympathetic nerves

strong stimulation

Frank-Starling mechanism of the heart

inhibition of sympathetic nerves

parasympathetic (vagal) stimulation

effects on cardiac function curve

sympathetic vasoconstrictor system

vasomotor center

vasoconstrictor area

vasodilator area

sensory area

tractus solitarius

cranial nerves IX & X

vasomotor tone

control of cardiac activity

lateral portion of vasomotor center → excitatory sympathetic

medial portion of vasomotor center → parasympathetic output

control of vasomotor center

reticular substance

hypothalamus

cerebral cortex

adrenal medullary function

sympathetic vasodilator system

anterior hypothalamic control

vasovagal syncope

Nervous system control of arterial pressure

changes effected

arteriolar constriction

venous constriction

autonomic stimulation of heart

exercise and alarm reaction

reflex mechanisms for arterial pressure maintenance

baroreceptor reflexes

anatomy

carotid sinus

Hering’s nn → glossopharyngeal nn

aortic receptors

vagus nn

baroreceptor response

circulatory reflex

vasodilatation

decreased chronotropy & inotropy

CNS ischemic response

function

Cushing reaction

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