脳底 のうてい動脈 どうみゃくではありませんでした
nō teidōmyakudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 脳底動脈

1. Was not a cerebral artery.; Was not a brainstem artery.

Past/Perfective
Negative
Polite
Formal Register