MICROANATOMY

Detailed explanation-1: -The pericardium consists of two layers: a visceral pericardium, which adheres to the external surface of the heart, and a parietal pericardium, in which a fibrous layer is formed by the visceral pericardium reflecting back on itself. The potential space between these two layers is called the pericardial cavity.

Detailed explanation-2: -The inner visceral pericardium, or epicardium, is attached to the heart and is part of the heart wall. There is a space between the visceral pericardium and the parietal pericardium and is referred to as the pericardial cavity.

Detailed explanation-3: -Between the layers is the pericardial cavity, a potential space filled with 15-50 milliliters of serous pericardial fluid. Pericardial fluid is secreted by pericardial cells, and it is this fluid that reduces friction between the parietal and visceral layer during heart contractions.