Zvorykin V P
Arkh Anat Gistol Embriol. 1976;71(11):58-66.
The work describes a new for dolphins type of the cytoarchitectonic organization and topographo-anatomical features of the dorsal nucleus of the external geniculate body found in the dolphin Phocaena phocaena. In dolphins only the alveolar type of organization of the formation in question had been known which was principally different from the laminar and nuclear types characteristic of the terrestrial mammals. The Phocaena phocaena proved to have the nuclear type of organization of the external geniculate body, as well as in certain mammals. In addition, a fact of a sharp quantitative diminution of the external geniculate body as compared with other dolphins has been revealed which is of interest for the physiology of vision. This fact is of significance showing the total amount of nerve cells in the dorsal nucleus of the external geniculate body of the Phocaena phocaena to be equal to 6,6% as compared with the white-sided dolphin. Since the above diminution proved to be selective and did not take place in the anterior tuber of the quadrigeminum, the author puts forward the idea that a considerably less afferentation comes to the visual cortex of the Phocaena phocaena than to that of other dolphins, due to some, yet unknown, restriction of the visual function.
这项研究描述了在港湾鼠海豚中发现的一种新的外侧膝状体背核细胞构筑组织类型及其拓扑解剖特征。在海豚中，此前已知的该结构的组织类型仅为肺泡型，这与陆生哺乳动物特有的层状和核状类型有很大不同。事实证明，港湾鼠海豚的外侧膝状体具有核状组织类型，某些哺乳动物也是如此。此外，研究还发现，与其他海豚相比，港湾鼠海豚的外侧膝状体在数量上急剧减少，这对视生理学具有重要意义。这一事实表明，港湾鼠海豚外侧膝状体背核中的神经细胞总数仅为白侧海豚的6.6%。由于上述减少是选择性的，且并未发生在四叠体前结节中，因此作者提出，由于视觉功能存在一些尚不清楚的限制，与其他海豚相比，港湾鼠海豚视觉皮层接收到的传入信息要少得多。
