Nucleus (nerve) -

... The length of the spinal cord in an adult is 28-29% of the height of the person (40-47cm in Japanese), and the weight ratio of the brain to the spinal cord is about 55:1, which shows how large the brain is in the central nervous system. Within the brain, the cerebral hemispheres (pallium and cerebral nucleus) account for 80% of the total brain weight, the cerebellum is about 11%, and the rest, the diencephalon, midbrain, pons, and medulla oblongata, are only 7-8% together. Figure 1 shows the shape of the human brain, Figure 2 shows the brain and meninges in the skull, Figure 3 shows the anatomical division of the brain and spinal cord, and Figure 4 shows the division of the central canal and ventricles. ...

*Some of the terminology explanations that mention "nucleus (nerve)" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　成人の脊髄は身長の28～29％の長さがあるが(日本人では40～47cm)，脳と脊髄の重量比は約55対1であり，中枢神経系において脳の占める割合がいかに大きいかがわかる。また，脳のなかでも大脳半球(大脳外套と大脳核)が全脳重の80％を占め，小脳は約11％，その他，間脳，中脳，橋，延髄は合わせて7～8％にすぎない。図1にヒトの脳の形態を，図2に頭蓋骨中の脳および髄膜，図3に脳･脊髄の解剖学的区分，図4に中心管と脳室の区分を示す。…

※「核（神経）」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