…the olfactory system is associated with the forebrain (forebrain vesicle), the visual system with the midbrain (mesencephalic vesicle), and the mechanical sensory system, such as wave motion, with the hindbrain (hindbrain vesicle). In these three parts, or brain vesicles, cell groups develop dorsolaterally to form the cerebrum, optic tectum, and cerebellum. As a result of this development, the three parts are transformed into five parts to complete the brain. … From the Brain…While the spinal canal continues to differentiate and develop into the spinal cord while retaining its original shape relatively well, the brain tube undergoes complex changes as the fetus grows. First, the brain tube is divided into three bulges (brain vesicles): the forebrain vesicle, the mesencephalon vesicle, and the rhombencephalon vesicle. The forebrain vesicle is further divided into the telencephalon and diencephalon vesicles, and the rhombencephalon vesicle into the hindbrain and myelencephalon vesicles. In humans, the brain tube is formed from five brain vesicles at the fifth week of fetal development. … *Some of the terminology that mentions "brain vesicle" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…すなわち嗅覚系は前脳(前脳胞)と,視覚系は中脳(中脳胞)と,波動のような機械的感覚系は後脳(後脳胞)と関連する。さらにこれらの3部分つまり脳胞brain vesicleでは,細胞集団が背外側に発達し,大脳,視蓋および小脳が形成される。この発達の結果,3部分は5部分に変形されて脳が完成する。… 【脳】より…脊髄管がその後も原形を比較的よく保ちながら脊髄に分化,発育するのに対して,脳管は胎児の成長につれて複雑に変形する。まず脳管は前脳胞,中脳胞,菱脳(りようのう)胞の三つの膨らみ(脳胞brain vesicle)に区分されるが,さらに前脳胞は終脳胞と間脳胞に,菱脳胞は後脳胞と髄脳胞に区分される。このように脳管が五つの脳胞から成立する時期は,ヒトでは胎生5週である。… ※「brain vesicle」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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