👉 Pericardium, also known as Pericardium, is a part of the heart that surrounds and protects the inner lining of the chest cavity. It acts as a cushion to protect the heart from external forces like blood pressure changes or trauma. The Pericardial Fluid (or Fluid) is produced by the pericardium itself and serves as a lubricant for the heart, keeping it in a fluid state and reducing friction against the walls of the heart, which can cause discomfort