parietal pericardium
(puh-RY-uh-tul PAYR-ih-KAR-dee-um)
The outer layer of the pericardium, which is a thin sac of tissue that surrounds the heart.
The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov.
Updates regarding government operating status and resumption of normal operations can be found at opm.gov.