the optic nerve
nerve cells/endings
At the end, give him 3 pills, one for the high blood pressure, [an]other for the heart and the last one for nerve problems. (Certificate in Advanced English; C1; Portuguese)
I sometimes suffer from nerves when I'm speaking in public.
I need something to calm my nerves.
You might feel you need it to calm your nerves, but for obvious reasons (the law) it is better not to. (Certificate in Advanced English; C1; Dutch)
You've got a nerve, coming here!
I can't believe she had the nerve to talk to me after what happened.
After that, how not to envy his redeeming feature of always be[ing] cool as a cucumber and how not to scorn yourself for not having the nerve to tell him what you really think! (Certificate of Proficiency in English; C2; Russian)
Please stop making that noise! It really gets on my nerves.
My neighbor is always quarrel[l]ing with his wife. It['s] getting on my nerves! (Certificate in Advanced English; C1; Greek)
I haven't got the nerve to tell him I'm leaving.
He lost his nerve and couldn't go through with it.
She just never had the nerve to leave everything behind. (Certificate of Proficiency in English; C2; Greek)
By the look on her face, he really hit a nerve with that last remark.
Some of your articles strike a very sensitive nerve in my opinion. (Certificate of Proficiency in English; C2; Greek)