pericardium; pericardial sac
Anatomical term for the double-layered membrane surrounding the heart.
心膜は心臓を包む薄い膜です。
The pericardium is a thin membrane that surrounds the heart.
心膜
Pericarditis is inflammation of the pericardium.
pericardial cavity
From 心 (heart) + 膜 (membrane).