Split brain

Japanese: 分離脳 - ぶんりのう(英語表記)split brain
Split brain
The human cerebrum consists of the left cerebral hemisphere (called the left brain) and the right cerebral hemisphere (called the right brain), and these two are connected by approximately 200 million nerve fibers. These nerve fibers form several nerve fiber bundles called the corpus callosum, anterior commissure, and hippocampal commissure. From the end of the 1940s, surgery to cut the corpus callosum began to be performed as a treatment for severe epilepsy, and in the early 1960s, surgery was performed to cut not only the corpus callosum but also the anterior commissure and hippocampal commissure in a single operation.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ヒトの大脳は左大脳半球(これを左脳という)と右大脳半球(これを右脳という)からなりたっており,この二つは約2億本の神経繊維で連絡されている。これらの神経繊維は,脳梁,前交連,海馬交連と呼ばれるいくつかの神経繊維束を形成している。1940年代の末から,重症癲癇(てんかん)の治療として,脳梁を切断する手術が行われはじめ,60年代の初めには,脳梁のみならず,前交連や海馬交連も一度で切断する手術が行われた。

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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