Relations

In relation to the other chambers of the heart, the right atrium is:

• superior and to the right of the right ventricle
• anterior and to the right of the left atrium

The right atrium contributes to the following surfaces of the heart:

• sternocostal - contributes to its right, superior part
• right
• posterior - contributes to its right part

Therefore, it has the following relations around the heart:

• anterior, from deep to superficial:
  • pericardium
  • mediastinal pleura
  • anterior part of mediastinal surface of right lung
• posterior:
  • and to the right: pulmonary veins
  • and to the left: interatrial septum medial to left atrium
• lateral, from medial to lateral:
  • pericardium
  • right phrenic nerve accompanied by pericardiophrenic vessels
  • right mediastinal pleura
  • mediastinal surface of right lung anterior to hilum
• medially, from medial to lateral:
  • ascending aorta
  • pulmonary trunk