中・下咽頭筋の発声と嚥下時の作動に関する筋電図学的研究
1976 年 22 巻 2 号 p. 236-241
詳細
1976 年 22 巻 2 号 p. 236-241
Physiological properties of the pharyngeal constrictor muscles were investigated by an electromyogram. The adult dogs were carefully anesthetized under neuroleptoanalgesia. Bipolar hooked wire electrodes were inserted into upper and lower portion of the hyopharyngeal, thyropharyngeal and cricopharyngeal muscle.
The contraction of the middle pharyngeal constrictor muscles showed a regularity of phasic pattern in fashion sinchronized with expiration. However the cricopharyngeal muscle burst unconcerned with respiration.
The contraction of the cricopharyngeal muscle was transitorily inhibited on swallowing. The bursts of the hyopharyngeal muscle were synchronized with thyropharyngeal muscle contracted simultaneously.
Bursts of the upper portion of the thyropharyngeal muscle preceded to the bursts of lower portion with a time lag of 200 msec, which meant us occurence of peristaltic movements.
