Distribution of Types of Neurons in the Optic Tectum of the Small-Spotted Dogfish,Scyliorhinus caniculaL. A Golgi Study
作者:
M.J. Manso,
R. Anadón,
期刊:
Brain, Behavior and Evolution
(Karger Available online 1993)
卷期:
Volume 41,
issue 2
页码: 82-87
ISSN:0006-8977
年代: 1993
DOI:10.1159/000113825
出版商: S. Karger AG
关键词: Optic tectum;Neuron types;Golgi method;Elasmobranchs;Scyliorhinus caniculaL.
数据来源: Karger
摘要:
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.
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