PHYL 3520 Lecture Notes - Lecture 29: Ventral Respiratory Group, Dorsal Respiratory Group, Respiratory Center
3 Apr 2020
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Phyl 3520 lecture 29 march 30, 2020 control of breathing. In the medulla, vrg consists of groups of neurons that control inspiration and expiration. These are coordinated and they send feedback to each other. Inspiration output are sent through the spinal cord via the motor neurons to regulate the movement of muscles that controls inspiration and expiration. The contraction of these muscles would regulate the ventilation of the lungs. Ventilation controls of partial pressures of gases into the blood (mostly into the arterial blood). Afferent: sensory information: brain stem control of breathing. Afferent (sensory) information reaches the medullary inspiratory center via central and peripheral chemoreceptors and mechanoreceptors. Efferent (motor) information is sent from the inspiratory center to the phrenic nerve, which innervates the diaphragm. Aortic and carotid bodies: aortic and carotid bodies contain baroreceptors and peripheral chemoreceptors. They sense changes in partial pressures of o2 and co2 and changes in ph. Major stimuli for the central and peripheral chemoreceptors.
