Thomas J P, Walsh E J
Department of Surgery, Southern Illinois University School of Medicine, Springfield 62702.
Otolaryngol Head Neck Surg. 1990 Sep;103(3):427-35. doi: 10.1177/019459989010300314.
Developmental changes in tympanic membrane to stapedial footplate areal ratios were investigated in kittens from birth through the twentieth postnatal day. Measurements from 45 kittens (85 temporal bones) were obtained from the pars tensa region of the tympanic membrane and the stapedial footplate region bounded by the annular ligament using standard macrophotographic and computer digitization techniques. Tympanic membrane and stapedial footplate areas were approximately 70% and 80%, respectively, of their adult size at birth and relevant areas increased exponentially during early postnatal life. Adultlike dimensions were achieved by the end of the first postnatal week. Tympanic membrane:stapedial footplate areal ratios increased from approximately 25:1 to 30:1 during the first postnatal week, before the developmental period during which adultlike auditory thresholds and response amplitudes are acquired. Thus, the areal ratio influences on impedance-matching characteristics of the middle ear do not appear to significantly affect the postnatal development of auditory function in cats.
研究了从出生到出生后第20天的小猫鼓膜与镫骨足板面积比的发育变化。使用标准宏观摄影和计算机数字化技术，从鼓膜紧张部区域和由环状韧带界定的镫骨足板区域获取了45只小猫（85块颞骨）的测量数据。出生时，鼓膜和镫骨足板面积分别约为成年大小的70%和80%，相关面积在出生后早期呈指数增长。出生后第一周结束时达到成年尺寸。在获得类似成年听觉阈值和反应幅度的发育阶段之前，鼓膜与镫骨足板面积比在出生后第一周从约25:1增加到30:1。因此，面积比对中耳阻抗匹配特性的影响似乎并未显著影响猫听觉功能的出生后发育。
