The heart is a hollow organ, muscle basically structure, equipped with proper motion, and, thanks to her contractions, acts as an engine of the circulatory system, pumping blood from inside their cavities to the whole organism.
It is placed inside the chest, between both lungs housed and supported above the diaphragm muscle, the whole is surrounded by a fibrous sac known as the pericardium comprises two layers. The inner layer is attached to the heart and is known as visceral pericardium or epicardium. The outer layer is called the pericardium parietal.Las two layers delimit the pericardial cavity that contains 30 to 40 mL of a clear liquid that acts as a lubricant and prevents the friction when the heart contracts.
The heart is located between the lungs in the middle of the chest, behind and slightly to the left of the sternum. A double-layered membrane called ‘pericardium’ around the heart like a sac. The outer layer of the pericardium surrounds the roots of the major blood vessels of the heart and is attached to the spine, diaphragm, and other parts of the body by ligaments. The inner layer of the pericardium is attached to the heart muscle.