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

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 胸鎖乳突筋

1. Not the sternocleidomastoid muscle.

Negative
Polite
Formal Register