A FUNCTIONAL ANATOMY OF THE EXTERNAL AND MIDDLE EAR OF THE BACTRIAN CAMEL (Camelus bactrianus)

作者：Bai Zhongtian; Wang Hongju; Yuan Guoqiang; Ye Wenling; He Jibin; Wang Jianlin^*

来源：Journal of Camel Practice and Research, 2009, 16(1): 115-120.

• Anatomy
• bactrian camel
• ear
• resonance
• transformer ratio

The special structure and function of the external and middle ears of the bactrian camel (Camelus bactrianus) were described and various anatomical and physiological parameters of the ear, such as the length of external acoustic meatus and ossicular chain lever, the areas of tympanic membrane and oval window were measured. Our data on the middle ear and transformer ratio on the bactrian camel were compared to those of other domestic animals, such as the horse, cattle, and the Indian elephant. The shapes of the external acoustic meatus, tympanic membrane and lever system of the ossicular chain of the bactrian camel all have its own properties. Based on functional parameters, it was calculated that the ear-canal resonance peak was at 1.3 kHz in bactrian camel. The transformer ratio of the middle ear was 49.6, times in bactrian camel. The data showed that the higher value in the bactrian camel may reduce the reflection of energy incurred as a result of the different acoustic impedences of air and inner ear fluid. All these special structures may increase the acoustical sensitivity by enhancing the transmission of sound in the bactrian camel, which lives in conditions of frequent sandstorms.

• 出版日期2009-6
• 单位兰州大学