Zvorykin V P
Arkh Anat Gistol Embriol. 1977 Dec;73(12):5-22.
The investigations performed demonstrate that morphologically cetacean neocortex is organized on the same principles as that of other mammals, as it has six layer structure, layer IV including. The results of investigations done for many years gave the possibility to establish quantitative characteristics of neocortex in different zoological cetacean genera, such as volume of neocortex, total number of its nervous cells (for dolphin the data were obtained for the first time), and clarify the problem fully enough. It became clear that morphologically dolphins belong to different genera. Three quantitative gradations of morphological enrichment of the dolphin neocortex are demonstrated. The only genus of Tursiops (bottle-nosed) can be compared with man, as to on what neuromorphological criteria it is behind, equal and surpasses the man. Representatives of the two other genera investigated, according to all neuromorphological indices studied, are far behind the man.
所进行的研究表明，从形态学上看，鲸类动物的新皮层与其他哺乳动物的新皮层组织原则相同，因为它具有六层结构，包括第四层。多年的研究结果使得确定不同鲸类动物属新皮层的定量特征成为可能，如新皮层的体积、其神经细胞的总数（首次获得了海豚的数据），并充分阐明了这一问题。很明显，从形态学上看，海豚属于不同的属。研究表明海豚新皮层在形态学上的丰富程度有三个定量等级。唯一的宽吻海豚属在神经形态学标准上落后于人类、与人类相当或超过人类，因此可以与人类进行比较。根据所有研究的神经形态学指标，另外两个被研究属的代表远远落后于人类。
