Müller M, Wess F P, Bruns V
Zoologisches Institut, J. W. Goethe Universität, Frankfurt am Main, FRG.
Hear Res. 1993 May;67(1-2):198-202. doi: 10.1016/0378-5955(93)90247-x.
In order to determine the place-frequency map of the cochlea in the marsupial Monodelphis domestica, iontophoretic HRP-injections were made at several locations in the ventral cochlear nucleus. Prior to iontophoresis the auditory neurons at these locations were characterized electrophysiologically. The resulting distribution of retrogradely labeled cochlear spiral ganglion cells was analysed by means of a three dimensional reconstruction of the cochlea. The map was established for frequencies between 2.4 and 44.5 kHz, corresponding to positions between 95 to 14% of basilar membrane length (base = 0%). The maximum slope amounted to 1.8 mm/octave. Over the basal-most 60% of the cochlea the slope of the place-frequency map was larger than 1.5 mm/octave, further apically the slope rapidly decreased to values below 0.8 mm/octave. The shape of the cochlear place-frequency map is similar to that described in placental mammals.
为了确定有袋动物家短尾负鼠耳蜗的部位-频率图，在腹侧耳蜗核的几个位置进行了离子电渗法辣根过氧化物酶注射。在离子电渗之前，对这些位置的听觉神经元进行了电生理特征分析。通过对耳蜗的三维重建，分析了逆行标记的耳蜗螺旋神经节细胞的分布情况。该图谱是针对2.4至44.5千赫兹之间的频率建立的，对应于基底膜长度95%至14%之间的位置（基底=0%）。最大斜率为1.8毫米/倍频程。在耳蜗最基部的60%范围内，部位-频率图的斜率大于1.5毫米/倍频程，再向顶端，斜率迅速降至0.8毫米/倍频程以下。耳蜗部位-频率图的形状与胎盘类哺乳动物中描述的相似。
