A portion of cardiac muscle tissue that is part of a right atrium [Automatically generated definition].
Synonyms:
exact_synonym:
cardiac muscle of cardiac right atrium; cardiac muscle of heart right atrium; cardiac muscle tissue of heart right atrium; cardiac muscle tissue of right atrium; cardiac muscle tissue of right atrium of heart; myocardium of right atrium; right atrium heart muscle; right atrium myocardium; textus muscularis of myocardium of right atrium; textus muscularis of myocardium of right atrium of heart; textus muscularis of myocardium of right cardiac atrium