pericardial cavity per·i·car·di·al cavity (pěr'ĭ-kär'dē-əl)
The fluid-filled space between the two layers of the pericardium.
This cavity forms in the region of the heart the rudiment of the pericardial cavity.
The septum between the pericardial cavity and the body cavity is attached on its dorsal aspect to the liver.
The horizontal septum forms, as is obvious from the above description, the dorsal wall of the pericardial cavity.
The pericardial cavity is separated from the peritoneal cavity by a thick muscular wall against which the liver abuts.
These tubules, after considerable subdivision, open by a large number of apertures into the pericardial cavity.
The pericardial cavity becomes completely separated from the body cavity, and a distinct pericardium is formed.
To understand the further changes in the pericardial cavity it is necessary to bear in mind its relations to the adjoining parts.