noun
diffuse nervous system
A biological term for a nervous system where nerve cells are spread throughout the body rather than concentrated in a central structure. Contrasts with 集中神経系 (centralized nervous system).
See also: 集中神経系
ヒドラは散在神経系を持つ生物の一例だ。
Hydra is an example of an organism with a diffuse nervous system.
集中神経系 refers to a centralized nervous system where neurons are clustered into structures like a brain or nerve cord, whereas 散在神経系 describes a network of neurons spread throughout the body without a central control center.
Compound of 散在 (scattered, dispersed) and 神経系 (nervous system). The term is a direct calque of the English 'diffuse nervous system'.