Manso M J, Anadón R
Department of Cellular and Molecular Biology, University of La Coruña, Spain.
Brain Behav Evol. 1993;41(2):82-7. doi: 10.1159/000113825.
The distribution of neuronal types in the six layers of the optic tectum of the small-spotted dogfish, Scyliorhinus canicula, was studied using Golgi methods. The eight types of neurons have a variable distribution, some of them represented in all six tectal layers. Most neurons of the optic tectum have a radial orientation, and a small portion are disposed horizontally. The relative ratios of the different neuronal types in the six layers indicate that about 80% of the tectal neurons are intermingled with the optic nerve axon terminals in the superficial layers of the tectum. These results corroborate previous reports that the tectum of this selachian species is more specialized than formerly supposed, in spite of the differences in degree of neuropil lamination with other non-mammalian vertebrates.
利用高尔基染色法研究了小斑星鲨（Scyliorhinus canicula）视顶盖六层中神经元类型的分布。八种神经元类型分布各异，其中一些存在于所有六层顶盖中。视顶盖的大多数神经元呈放射状排列，一小部分呈水平排列。六层中不同神经元类型的相对比例表明，约80%的顶盖神经元与顶盖表层的视神经轴突终末相互交织。这些结果证实了先前的报道，即尽管这种板鳃类动物的神经毡分层程度与其他非哺乳动物脊椎动物存在差异，但其顶盖比之前认为的更为特化。
