胸鎖 きょうさ乳突 にゅうとつ すじじゃありませんでした
kyōsa nyū totsusujijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 胸鎖乳突筋

1. Was not the sternocleidomastoid muscle.

Past/Perfective
Negative
Polite
Terminal Form