Betz, VA (English spelling) BetzVA

Japanese: Betz,V.A.(英語表記)BetzVA
Betz, VA (English spelling) BetzVA

…In the human cerebral motor cortex, the lips and tongue areas occupy the largest areas in the face area, and the hands in the upper limb area, clearly demonstrating that humans are animals that use their hands to speak. The Russian physiological anatomist Betz (1874) was the first to describe giant pyramidal cells in layer V of the cerebral motor cortex. For a long time, these giant pyramidal cells were considered to be the origin cells of the pyramidal tract, but it was discovered that the medulla oblongata has 1 million nerve fibers, while the giant pyramidal cells have 20,000 to 50,000 fibers. Today, all pyramidal cells in layer V of the cerebral motor cortex are considered to be the origin cells of the pyramidal tract. …

*Some of the terminology that mentions "Betz, VA" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ヒトの大脳皮質運動野では顔面域のうちでも口唇・舌域が,上肢域のうちでも手域がとび抜けて広い区域を占め,ヒトが手を使い言葉を話す動物であることを如実に示している。かつて大脳皮質運動野の第V層に巨大錐体細胞を記載したのはロシアの生理解剖学者ベッツV.A.Betz(1874)である。長い間錐体路の起始細胞はこの巨大錐体細胞といわれてきたが,延髄錐体の神経繊維が100万本であるのに巨大錐体細胞は2万~5万本であることがわかって,今日では大脳皮質運動野の第V層のすべての錐体細胞が錐体路の起始細胞とみなされている。…

※「Betz,V.A.」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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