ANATOMY

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 pericardial cavity is the space between the parietal and the visceral layers. Two regions of the pericardial cavity have special names. The transverse sinus of the pericardial cavity lies between the ascending aorta and the pulmonary trunk in front and the venae cavae and the atria behind.

Detailed explanation-3: -The space between these two serous layers, the parietal and the visceral, is the pericardial cavity, which contains pericardial fluid.

Detailed explanation-4: -The pericardial cavity is the potential space formed between the two layers of serous pericardium around the heart. Normally, it contains a small amount of serous fluid that acts to reduce surface tension and lubricate. Therefore, the cavity facilitates the free movement of the heart.

Detailed explanation-5: -Serous membrane lines the pericardial cavity and reflects back to cover the heart-much the same way that an underinflated balloon would form two layers surrounding a fist.