An endogenous substance whose activities affect or play an important role in the functioning of the nervous system. Included here are catecholamines, neuroregulators, neurophysins, etc.

• 其活动影响神经系统或对神经系统起重要作用的一种内源性物质；包括儿茶酚胺；神经调节质；垂体后叶激素运载蛋白；等.