PATHOLOGY

Detailed explanation-1: -Also entering the right atrium is the coronary sinus, which carries venous return from the coronary arteries (i.e. the blood supply to the heart). Finally, also entering the right atrium are the venae cordis minimae (tiny cardiac veins which open directly into the right atrium).

Detailed explanation-2: -The oxygen-poor blood enters the right atrium (RA), or the right upper chamber of the heart. From there, the blood flows through the tricuspid valve (TV) into the right ventricle (RV), or the right lower chamber of the heart.

Detailed explanation-3: -Tricuspid valve. This valve is located between the right atrium and the right ventricle.

Detailed explanation-4: -The dome of the atrium is pierced by the superior vena cava, while the posteroinferior part receives the inferior vena cava. A triangular, muscular sac known as the right auricle (right atrial appendage) extends anteriorly and to the left, partially covering the base of ascending aorta.