The physiological study on the expression mechanism of pharyngeal peristaltic waves

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The absolute standard of the onset of pharyngeal stage on swallowing reflex controlled by medulla oblongata, is not established. The expression mechanism of the pharyngeal peristaltic wave has not been clarified, but this wave constantly appears for swallowing reflex. Therefore, it is considered that the pharyngeal peristaltic wave can be the absolute standard of the onset of the pharyngeal stage. The peristaltic movement of alimentary canal is coordinated movements of longitudinal muscle and circular muscle. Similarly, it is considered that the pharyngeal peristaltic movement is coordinated movements of pharyngeal longitudinal muscles and pharyngeal constrictor muscles. We analyzed relationship of elevation and constriction of pharynx with video-fluorography of the swallowing motion. The result revealed that the movement of series had high reproducibility. We suggest that the elevation movement of pharynx may be involved in the expression of the pharyngeal peristaltic wave.