Where does “nerve” come from?

Nerve comes from Medieval Latin nervus, from Latin nervus, from Proto-Indo-European snḗh₁wr̥, ultimately from Proto-Indo-European (s)neh₁-.

nerve (English): A bundle of neurons with their connective tissue...

Definitions

Step	Language	Word	Meaning
1	Middle English	nerve	A nerve bundle of neurons
2	Medieval Latin	nervus	nerve; A sinew, tendon, nerve, muscle; A cord,...
3	Latin	nervus	A sinew, tendon, nerve, muscle; A cord, string or...
4	Proto-Indo-European	(s)new-	—