noun
Anatomical term for the physical nerve fibers and the nervous system.
歯の神経を抜く治療を受けた。
I had treatment to remove the nerve from my tooth.
noun
Refers to mental or emotional sensitivity, often in contexts of stress, worry, or being easily affected by things. Common in phrases like 神経を使う (to be nerve-racking) and 神経が細かい (to be sensitive).
彼は細かいことによく神経を使う。
He often worries about small details.
あの人は神経が太いね。
That person is really thick-skinned, isn't he?