In this paper , a case of dehiscent jugular bulb presenting as an asymptomatic retrotympanic bluish mass in the right ear of a 49 - year - old male is reported 本文报告一49岁男性，在例行健康检查时，发现右耳鼓膜后面，锤骨柄下方有一半球形暗黑色肿块。
4.
For bats to listen to the echoes of their original emissions and not be temporarily deafened by the intensity of their own calls , the middle ear muscle contracts to separate the three bones there , the malfeasances and stapes ” , and reduce the hearing sensitivity 对蝙蝠来说，为了听到它们最初发出的声音的回音并不被它们自己的声音强度暂时震聋，中耳肌肉收缩将那里的锤骨、砧骨和镫骨分开并减小听觉的敏感度。
