Tarpley R J, Ridgway S H
Naval Ocean Systems Center, San Diego, Calif.
Brain Behav Evol. 1994;44(3):156-65. doi: 10.1159/000113587.
The midsagittal surface area of the corpus callosum was determined by computer-assisted morphometry in juvenile and adult members of 13 species of the cetacean family Delphinidae. In 57 brains, absolute callosal areas ranged from 104 to 829 mm2. When compared to other mammal groups possessing a corpus callosum, callosal area in dolphins was smaller in relation to brain mass with a ratio range (mm2/g) of 0.08-0.31. The corpus callosum was decreased relative to brain mass in the larger-brained odontocetes, suggesting that increases in brain size were not necessarily allied with needs for equivalent increases in callosal linkage. One delphinid species, Tursiops truncatus, for which the largest single-species sample was available, was examined for sex differences in callosal size relative to brain mass. Among 10 males and 5 females the averaged ratio was not distinguishable between sexes.
通过计算机辅助形态测量法，测定了13种海豚科鲸类幼体和成体大脑胼胝体的矢状面面积。在57个大脑中，胼胝体的绝对面积在104至829平方毫米之间。与其他具有胼胝体的哺乳动物群体相比，海豚的胼胝体面积相对于脑质量较小，比例范围（平方毫米/克）为0.08至0.31。在脑容量较大的齿鲸中，胼胝体相对于脑质量有所减小，这表明脑容量的增加不一定与胼胝体连接相应增加的需求相关。对于有最大单物种样本的宽吻海豚这一海豚物种，研究了胼胝体大小相对于脑质量的性别差异。在10只雄性和5只雌性中，平均比例在两性之间没有差异。
