THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The superior part of the heart, formed mainly by the left atrium lies just inside the second costal space on the left hand side.

Detailed explanation-2: -It is not the most inferior surface of the organ but rather the most superior. It assumed the term because it is thought to resemble the base of the pyramid or cone which extends obliquely to the left to the apex of the heart.

Detailed explanation-3: -The base of the heart is located at the level of the third costal cartilage, as seen in Figure. The inferior tip of the heart, the apex, lies just to the left of the sternum between the junction of the fourth and fifth ribs near their articulation with the costal cartilages.

Detailed explanation-4: -Within the mediastinum, the heart is separated from the other mediastinal structures by a tough membrane known as the pericardium, or pericardial sac, and sits in its own space called the pericardial cavity.