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在南部非洲某些沙漠地区,有一种鼠类其听觉非常敏锐,能感受到1000～5000Hz频率很低强度的声音,这和人的语言频率很接近。研究其中耳解剖及生理机制,希望为临床提供些有价值的参考资料。作者用4只鼠的干燥头颅中取下的鼓膜和听骨链,进行大体解剖观察。发现这种鼠的耳部构造有如下解剖特征:(1)有副鼓膜。此结构首先由Hyrtl(1845)描述,并得到组织学的证实,它与鼓膜紧张部相同。此膜附着于槌骨颈的下半部。(2)槌骨颈较长,砧骨长突较
In some desert areas of Southern Africa, one species of rat is very sensitive to hearing and has a very low-intensity sound of 1000-5000 Hz, which is very close to human speech frequency. To study the middle ear anatomy and physiological mechanisms, hoping to provide some valuable reference for clinical. The authors removed the tympanic membrane and the ossicular chain from the dry skull of 4 rats for gross anatomical observation. The structure of the ear of this rat was found to have the following anatomical features: (1) An accessory tympanic membrane. This structure was first described by Hyrtl (1845) and confirmed by histology, which is the same as the eardrum. This membrane attaches to the lower half of the mallet neck. (2) mallet neck longer, longer than the incus medulla oblongata