Comparison of acoustic structures between heads of a narrow-ridged finless porpoise fetus and its mother
Comparison of acoustic structures between heads of a narrow-ridged finless porpoise fetus and its mother
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窄脊江豚胎儿与其母体头部声学结构比较
DOI：
10.1093/jmammal/gyw057
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发表时间：
2016-07
影响因子：
1.7
通讯作者：
Per Berggren
中科院分区：
文献类型：
--
作者：
Yu Zhang;Xianyan Wang;Chong Wei;Per Berggren
利用计算机断层扫描（CT）对2014年4月在中国福建省惠安搁浅的雌性江豚（Neophocaena asiaorientalis sunameri）胎儿和母体中参与声音产生和接收的组织结构进行了比较。CT图像定性分析显示，10月龄胎儿主要听力学组织发育，包括瓜、脂肪、下颌脂肪、肌肉和结缔组织。与母体相比，胎儿颅骨未封闭，没有气囊和鼻道，上颌骨较薄。此外，使用CT扫描的Hounsfield单位（HU）测量值来量化胎儿与其母体在甜瓜、脂肪、下颌脂肪、肌肉和结缔组织方面的差异。统计分析显示，胎儿和母体5种结构（甜瓜、脂肪、下颌脂肪、肌肉和结缔组织）的HU差异有统计学意义（P < 0.001）。胎儿的甜瓜、脂肪、下颌脂肪和肌肉的HU中值（分别为-61.0、-74.0、-24.0和25.0）高于母体（分别为-85.0、-85.0、-69.0和12.0）。然而，结缔组织中位HU值（50.0）低于母体中位HU值（60.0）。结果表明，胎儿的声组织结构发育不完全，根据胎儿的实际年龄，胎儿的声组织结构可能在出生时尚未完全形成。需要进一步的研究来确定江豚幼崽在什么年龄已经完全发育出产生和使用超声波光束进行回声定位所需的组织结构。
Computed tomography (CT) was used to compare the tissue structures involved in sound production and reception in a fetus and its maternal body of a female finless porpoise (Neophocaena asiaorientalis sunameri) found stranded at Huian, Fujian Province, China, in April 2014. Qualitative assessment of the CT images revealed the physical development of main acoustic tissues including melon, blubber, mandibular fat, muscle, and connective tissue in a 10-month old fetus. Compared to the maternal body, the cranium of the fetus was not enclosed, air sacs and nasal meatus were both absent, and the maxilla was much thinner. Furthermore, Hounsfield unit (HU) measurements from CT scanning were used to quantify the difference between the fetus and its maternal body for melon, blubber, mandibular fat, muscle, and connective tissue. Statistical analyses revealed significant differences in HU between all 5 structures melon, blubber, mandibular fat, muscle, and connective tissue (P < 0.001) both in the fetus and maternal body. The median HU values of melon, blubber, mandibular fat, and muscle in the fetus (–61.0, –74.0, –24.0, and 25.0, respectively) were higher than those recorded in the maternal body (–85.0, –85.0, –69.0, and 12.0, respectively). However, the median HU value of connective tissue (50.0) in the fetus was lower than that recorded in the maternal body (60.0). The results show that the acoustic tissue structures were not fully developed in the fetus and depending on the actual age of the fetus the structures may not be fully formed by the time of birth. Further studies are needed to determine at what age finless porpoise calves have fully developed the tissue structures needed to produce and use ultrasound beams for echolocation.
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DOI：
--
发表时间：
1979
期刊：
--
影响因子：
--
作者：
T. Kasuya;K. Kureha
通讯作者：
T. Kasuya;K. Kureha
影响因子：
2.4
作者：
AROYAN, JL;CRANFORD, TW;NORRIS, KS
通讯作者：
NORRIS, KS
DOI：
10.1119/1.1932798
发表时间：
1950
期刊：
--
影响因子：
--
作者：
L. E. Kinsler;A. R. Frey
通讯作者：
L. E. Kinsler;A. R. Frey
影响因子：
2.4
作者：
NORRIS, KS;HARVEY, GW
通讯作者：
HARVEY, GW
DOI：
--
发表时间：
1990
期刊：
--
影响因子：
--
作者：
F. Duck
通讯作者：
F. Duck