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作者测定狗、猫、猴腭帆张肌、腭帆提肌收缩时,鼓室、咽鼓管内压力的变化,并研究这些肌肉与咽鼓管的排液功能的关系。实验结果发现,这几种动物当电刺激腭帆张肌时都会出现短暂的鼓室压力降低,但刺激腭帆提肌时鼓室压力无改变。咽下运动时出现与刺激腭帆张肌相同的鼓室压降低,在咽下运动结束时鼓室恢复到大气压水平。实验还证明,在鼓室和咽腔之间无压力差时,腭帆张肌收缩还常形成咽鼓管内负压,这说明鼓室的容积包含咽鼓管管腔在内。腭帆张肌收缩时可继续保持鼓室负压,随着肌肉的松弛,中耳压力与外界平衡,这时可认为咽鼓管末端仍保持闭锁与外界不通。将猫的鼓泡除去,以靛卡红染液注入咽鼓管鼓口,以电流刺激腭帆张肌时可见咽鼓管鼓口的染色液被吸入咽鼓管内,在咽鼓管咽口也可观察到数次与腭帆张肌刺激结束一致的排液现象。
The authors measured changes in pressure in the tympanic space and eustachian tube in dogs, cats, levator ani, the levator ani, and studied the relationship between these muscles and the drainage function of the eustachian tube. The experimental results showed that when these animals were electrically stimulated palatal stenosis, tympanic pressure decreased briefly, but tympanic pressure did not change when stimulating the levator palate. The same tympanic depression occurred during swallowing as stimulating the palatal stenosis, and the tympanic returned to atmospheric pressure at the end of swallowing. Experiments also show that in the absence of pressure difference between the tympanic cavity and the pharyngeal cavity, palatal muscle contraction often form a negative pressure within the eustachian tube, indicating that the tympanic cavity volume including the eustachian tube lumen included. Palate sagittal muscle contraction can continue to maintain the tympanic negative pressure, with the muscle relaxation, the middle ear pressure and the outside world balance, this time can be considered Eustachian tube end still remain blocked with the outside world barrier. The cat’s bubbling removed to indigo card red dye into the eustachian tube drum mouth to current stimulation of the palatal fan when the eustachian tube drum can be seen in the dye solution is inhaled into the eustachian tube in the eustachian tube pharynx mouth Can be observed several times and palatal fan Zhang muscle stimulation end of the discharge phenomenon.