<prompt> NOT true about right atrium:Fossa ovalis represent remnant of foramen ovaleAnterior and posterior pas are divided by Crista terminalisAnterior pa is derived from absorption of right horn of sinus venosusPosterior pa is smooth  <response>: Anterior rough pa of right atrium is derived from primitive atrium. Posterior smooth pa sinus venarum is derived from absorption of right horn of sinus venosus. Crista terminalis is the boundary line between the rough and smooth pas. On outer surface this demarcation is known as sulcus terminalis Fossa ovalis represents remnant of foramen ovale limbus fossa ovalis is remnant of septum secundum 