AH 2330 Lecture Notes - Lecture 23: Glossopharyngeal Nerve, Cardiac Output, Sympathetic Nervous System
Document Summary
Cardioacceleratory center located in medulla: gives sympathetic stimulation to both conductive and contractile myocytes inside heart. Cardioinhibitory center cardiac contraction as well as adrenergic receptors on the arteriole receptors increase tpr: and the vagus nerve parasympathetically only conductive cells, majority of the peripheral blood vessels contain alpha-adrenergic. Parasympathetic system: does not innervate arterioles potential in the conductive cardiac myocytes. Reduce cardiac output (stroke volume x heart rate) cardiac output. Summary: sympathetic: increases map, parasympathetic: decrease map, both do it through slightly different mechanisms. What would cause activation of the sympathetic nervous system: activate the baroreceptor reflex. Some vessels like the carotid artery and the aortic arch are innervated by the. When they sense this, they send afferent signals that are used to modulate or change neurons that make up the glosso-pharyngeal nerve (ix) and contain baroreceptors. Baroreceptors sense changes in pressure created by blood flowing through the vessels the cardiac control centers that we all just talked about.
