胸鎖 きょうさ乳突 にゅうとつ すじではありませんでした
kyōsa nyū totsusujidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 胸鎖乳突筋

1. Was not the sternocleidomastoid muscle.

Past/Perfective
Negative
Polite
Formal Register