Esophageal Motor Disorders
The orderly propulsion of a bolus following its ingestion is caused by a set of coordinated activities in the muscles of the esophagus. This organized motility is caused by a number of complex events that take place in the brain stem, extrinsic and intrinsic nerves, and muscles of the esophagus. From a simplistic point of view, after mastication and organization of the bolus in the mouth, the cheek, tongue, and muscles of the floor of the mouth propel the bolus back into the pharynx. The stimulation of the receptors in the pharynx by the bolus results in afferent impulses that travel along the fifth, seventh, ninth, and tenth cranial nerves into the brain stem. In the medulla oblongata these nerve impulses are coordinated, and programmed efferent impulses travel along the vagus nerve and coordinate motor events in the esophagus.
KeywordsLower Esophageal Sphincter Distal Esophagus Muscle Thickness Lower Esophageal Sphincter Pressure Pneumatic Dilation
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