Three Kinds of Relaxation Occur in the Gastric Reservoir

Neurally mediated decreases in tonic contracture of the musculature are responsible for relaxation in the gastric reservoir (i.e., increased volume). Three kinds of relaxation are recognized. Receptive relaxation is initiated by the act of swallowing. It is a reflex triggered by stimulation of mechanoreceptors in the pharynx followed by transmission over afferents to the dorsal vagal complex and activation of efferent vagal fibers to inhibitory motor neurons in the gastric ENS. Adaptive relaxation is triggered by distension of the gastric reservoir. It is a vago-vagal reflex triggered by stretch receptors in the gastric wall, transmission over vagal afferents to the dorsal vagal complex, and efferent vagal

Vagovagal Reflex

Adaptive relaxation in the gastric reservoir.

^■■■■■■■■P Adaptive relaxation is a vago-vagal reflex in which information from gastric stretch receptors is the afferent component and outflow from the medullary region of the brain is the efferent component. Vagal efferents transmit to the ENS, which controls the activity of inhibitory motor neurons that relaxes contractile tone in the reservoir.

Adaptive relaxation in the gastric reservoir.

^■■■■■■■■P Adaptive relaxation is a vago-vagal reflex in which information from gastric stretch receptors is the afferent component and outflow from the medullary region of the brain is the efferent component. Vagal efferents transmit to the ENS, which controls the activity of inhibitory motor neurons that relaxes contractile tone in the reservoir.

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