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The Midbrain and Brain Stem
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The Midbrain and Brain Stem

There are some important centers beside cranial nerves nuclei in the brain stem: a vasomotor center that exerts an influence in vasodilation and vasoconstriction and regulates blood; a heart rate regulating center; a respiratory reflex center. These are probably situated in the reticular formation of the medulla near the floor of the fourth ventricle in close association with the dorsal efferent nucleus of the vagus nerve.



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