16+ Short Note On External Structure Of Heart Pictures. Heart lies in the middle mediastinum. The epicardium is a serious membrane and is the outer most layers.
It is important to remember that when understanding the inside of the heart the left and right side are in labelled the wrong way round (figure 2). The division of the heart into four cavities is indicated on its surface by grooves.the atria are separated from the ventricles by the coronary sulcus (auriculoventriculargroove); Shape and weight of human heart:
Base (posterior), diaphragmatic (inferior), sternocostal (anterior), and left and right pulmonary surfaces.
It is marked by the presence of four openings that allow blood to move from the atria into the ventricles and from the ventricles into the pulmonary trunk and aorta. 5 change diagrams if needed. The heart is a hollow organ that contains four chambers, various apertures, valves and great blood vessels. It allows enough room for vigorous pumping, but also keeps the heart in place, reducing friction between the heart and other structures.