| Project/Area Number |
09660317
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Basic veterinary science/Basic zootechnical science
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| Research Institution | NAGOYA UNIVERSITY |
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Principal Investigator |
NAITO Jumpei Nagoya University, Sch. of Grad. Bioagri. Sci., Asso. Prof, 大学院・生命農学研究科, 助教授 (30048467)
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| Co-Investigator(Kenkyū-buntansha) |
EBIYARA Shibufumi Sch. of Grad. Bioagri. Sci., Prof, 大学院・生命農学研究科, 教授 (50135331)
MATSUSHIMA Toshiya Sch. of Grad. Bioagri. Sci., Asso. Prof, 大学院・生命農学研究科, 助教授 (40190459)
HIRUGAKI Kunjun Sch. of Grad. Bioagri. Sci., Asso. Prof, 大学院・生命農学研究科, 助教授 (00126898)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | bird / chick / sensory organ / vision / retina / ganglion cells / tectum / binocular vision / ヒヨコ胚 / リズム / 網膜視蓋投射 |
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| Research Abstract |
We can conclude the results obtained in three points as follows. 1) Retinotectal fiber terminals and the dendrites that receive the terminals formed interdigitation each other to shape large synaptic complexes. (a) Compared to the optic fiber terminals in the superior colliculus (cat, rabbit, hamster), arborization of preterminal branches of optic fibers in the chick tectum was more complex. (b) Synaptic complexes of the optic nerve terminals in the chick tectum were more complex than the glomerulus in the mammalian lateral geniculate body. (c) Sizes of the synaptic complexes of the optic fiber terminals in the tectum were more constant compared to those in the superior colliculus. (d) Shapes and sizes of dendritic postsynaptic elements were more variable than those in the superior colliculus. 2) Substance-P and acetylcholine receptor immunoreactive neurons in the retinal ganglion cell layer sent axons to the layer B and layer F of the chick tectum, respectively. Ganglion cells in the former has small somata with simple and narrow dendritic arborization. In the latter, more than two subtypes of ganglion cells were observed. One type of them had large somata with simple and broad dendritic arborization. 3) We studied the binocular vision by behavioral methods in chicks that received destruction of one eye on embryonic day 4. There was no significant difference in the rate of hit of black beads between the operated and normal chicks. The results suggest that the avian binocular vision would not necessarily require both eyes. Probably, the binocular vision in birds is carried out by the peculiar retinotectal system to birds.
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