Computerized tomography of the otic capsule and otoliths in the oyster toadfish, Opsanus tau
Computerized tomography of the otic capsule and otoliths in the oyster toadfish, Opsanus tau
复制标题
牡蛎蟾蜍 Opsanus tau 耳囊和耳石的计算机断层扫描
作者：
P. Edds;J. Arruda;R. Fay;D. Ketten
蟾鱼（Opsanus tau）的神经头盖骨在耳囊（OC）中显示出一个明显的半透明区域，这可能对听觉通路具有功能意义。本研究使用超高分辨率计算机断层扫描（100µm体素）比较神经颅骨沿OC的三个部位（背外侧、中外侧和腹内侧）和两个参考部位（背侧：枕上嵴；腹侧：副椎骨）的相对密度。结构密度越大，衰减越大；因此，我们比较了测量到的X射线衰减，它提供了相对密度的测量。记录整个耳膜连续切片上的五个部位（x和y）的最大衰减值，以及耳膜中与感觉黄斑（耳膜、球囊和耳室）相关的三个钙质耳石的最大衰减值。所有三个耳石都比神经头盖骨的任何部位有更高的衰减。在所有个体中，背侧和腹侧参考部位（分别为枕上嵴和副椎骨）的衰减水平与钙化骨一致，并且沿OC长度有相对较小的不规则变化。最低的相对衰减（最低密度）一致地发生在沿OC的三个站点。此外，沿OC测量的最低衰减发生在囊状耳石周围的腹内侧部位。沿OC的骨密度下降与颅骨中存在低密度通道以促进声刺激向耳内听器官传递的假设相一致。中国生物医学工程学报，2016,36(6):344 - 344。©2014 Wiley期刊公司
The neurocranium of the toadfish (Opsanus tau) exhibits a distinct translucent region in the otic capsule (OC) that may have functional significance for the auditory pathway. This study used ultrahigh resolution computerized tomography (100 µm voxels) to compare the relative density of three sites along the OC (dorsolateral, midlateral, and ventromedial) and two reference sites (dorsal: supraoccipital crest; ventral: parasphenoid bone) in the neurocranium. Higher attenuation occurs where structural density is greater; thus, we compared the X‐ray attenuations measured, which provided a measure of relative density. The maximum attenuation value was recorded for each of the five sites (x and y) on consecutive sections throughout the OC and for each of the three calcareous otoliths associated with the sensory maculae (lagena, saccule, and utricle) in the OC. All three otoliths had higher attenuations than any sites in the neurocranium. Both dorsal and ventral reference sites (supraoccipital crest and parasphenoid bone, respectively) had attenuation levels consistent with calcified bone and had relatively small, irregular variations along the length of the OC in all individuals. The lowest relative attenuations (lowest densities) occurred consistently at the three sites along the OC. In addition, the lowest attenuations measured along the OC occurred at the ventromedial site around the saccular otolith for all seven fish. The decrease in bone density along the OC is consistent with the hypothesis that there is a low‐density channel in the skull to facilitate transmission of acoustic stimuli to the auditory endorgans of the ear. J. Morphol. 276:228–240, 2015. © 2014 Wiley Periodicals, Inc.