Asezarea celor doua tipuri de substanta la nivelul organelor nervoase:
- Maduva spinarii – substanta alba la exterior (aspect de cordoane)
- substanta cenusie la interior (aspect de fluture sau litera H)
- Encefal:
- Trunchi cerebral – substanta alba la exterior si printre nucleii de substanta
cenusie
- substanta cenusie la interior sub forma de nuclei separati intre ei prin substanta alba
- Cerebel – substanta alba la interior
- substanta cenusie la exterior = SCOARTA CEREBELOASA si la interior sub forma de nuclei
- Diencefal - 5 mase de substanta cenusie (talamus, epitalamus, subtalamus, metatalamus, hipotalamus)
- Emisfere cerebrale – substanta alba la interior
- substanta cenusie la exterior = SCOARTA CEREBRALA