Eardrum displacement following stapedius muscle contraction.
Eardrum displacement following stapedius muscle contraction.
复制标题
镫骨肌收缩后鼓膜移位。
DOI：
10.3109/00016487609107472
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发表时间：
1976
影响因子：
1.4
通讯作者：
J. Harris
中科院分区：
文献类型：
--
作者：
A. Yonovitz;J. Harris
同时监测人受试者在同一只耳朵的鼓膜位移的鼓室压计，和阻抗与电声桥，提供有关的镫骨肌的收缩及其对鼓膜位移的影响的信息。采用广泛的控制程序，仅引起镫骨肌反射;较低强度的听觉刺激，同侧外耳道的电刺激，以及导致鼓膜张肌的神经麻醉。结果表明：（1）镫骨肌对听觉刺激和皮肤电刺激的反应形式是不可预测的，只有耳的反应形式是可预测的。(2)在高声音强度相对较大的向内和双相运动的鼓膜发生在正常的耳朵，毫无疑问，由于收缩的鼓膜张肌。这些结果进一步验证了一组镫骨切除耳，没有镫骨肌，但与正常的鼓膜张肌。(3)鼓张肌不出现双相反应，只有耳，只有单相向内反应。(4)在对眼眶进行喷气刺激时，这些受试者的张量反应加重，与正常耳朵相比，鼓膜发生了大的向内运动，这表明镫骨肌的存在改变了张量反应。基于外耳道和鼓膜的模型计算实际鼓膜位移的估计值。
Simultaneous monitoring in human subjects on the same ear of eardrum displacement by tympanomanometry, and impedance with the electroacoustic bridge, provided information concerning contraction of the stapedius muscle and its effect on eardrum displacement. Extensive control procedures were employed to elicit only the stapedius reflex; lower intensity auditory stimulation, electrocutaneous stimulation of the homolateral external ear canal, and anesthetization of nerves leading to the tensor tympani. Following these procedures the following results were obtained: (1) Extremely small biphasic and monophasic eardrum movements were seen in the stapedius--only ear to auditory and electrocutaneous stimulation; the form of the response was much less predictable to auditory stimulation. (2) At high sound intensities relatively large inward and biphasic movements of the eardrum occurred in the normal ear, unquestionably due to contraction of the tensor tympani. These results were further validated in a group of stapedectomized ears, without the stapedius but with normal tensor tympani. (3) Biphasic responses did not occur in the tensor tympani--only ear, only monophasic inward responses. (4) Upon air-jet stimulation to the orbit of the eye, these subjects had an accentuated tensor response in that large inward movements of the eardrum occurred as compared with those in normal ears, suggesting that there is an alteration of the tensor response by the presence of the stapedius muscle. Estimates of the actual eardrum displacement were calculated based on a model of the external ear canal and eardrum.