Where does “νευρο-” come from?

νευρο- (Ancient Greek) comes from Ancient Greek νεῦρον, from Proto-Indo-European snéh₁wr̥, from Proto-Indo-European (s)neh₁- — to spin , to sew.

Ancestry of “νευρο-”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	νεῦρον	sinew, tendon; cord, of a slingshot, bowstring;...
2	Proto-Indo-European	snéh₁wr̥	sinew, tendon
3	Proto-Indo-European	(s)neh₁-	to spin , to sew

νευρο- — Etymology, Origin & Word History | Etymology Explorer