Electromyographic and Radiocinephotographic Investigation of Dynamics and Physiology in Deglution

Abstract

Electromyographic and Roentgenological investigation on deglutition was done by means of simultaneous recordings of E. M. G. beams and X-ray television.The bolus is transferred to the mesopharynx when the inferior constrictor and thyropharyngeus muscles are fully to be dilated, on the other hand, the mylohyoid and other muscles with hyoid bone are fully contracted.Right at and after the bolus passes through hypopharyngeal area, thyropharyngeal and inferior constrictor muscles become fully contracted to make bolus reaches to the entrance of esophagus where the functional sphinctor, the cricopharyngeus muscle, is located. This muscle becomes fully dilated in order to accept the bolus to pass this point, then contracts in maximum point to have the bolus is ransferred to the esophagus where the esophageal peristalsis takes place.Mechanism of the swallowing is really the series of actions of the muscles, namely; relaxation, contraction and relaxation. The only exception is the action of cricopharyngeus muscle. This muscle ordinarily stays in the phase of contraction and relaxes only when bolus reaches to this point.Amplitudes of the muscle contruction range between 500 and 800 microvolts. The diseased shows the different patterns of deglutition. Generaly, dysphagia with the region of central nervous system shows the abnormal and disorganized patterns with probable abnormally higher and lower amplitudes and that with the region of lower motor neuron shows abnormal E. M. G. potentials besides.