The external structure of human heart - Ishwaranand

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The external structure of human heart

The external structure of the human heart 

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  • The wall of the heart consists of three layers outer epicardium composed of a single layer of flat epithelial cells called mesothelium the middle layer is called myocardium composed, the middle layer is called myocardium composed of cardiac muscles for contraction and relaxation of the heart and the innermost layer is called endocardium which consist of a single layer of flat epithelial cell called the endothelium.
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Image Source ~ Crafted With ©Ishwaranand - 2020 ~ Image by ©Ishwaranand
  • Externally on the surface of heart, there are two groovers, these are called sulci, these are coronary sulcus and interventricular sulcus. The coronary sulcus and transverse groove and divides the heart into anterior, smaller and thin-walled auricles and posterior, larger and thick-walled ventricles. The interventricular sulcus is an oblique longitudinal groove on the ventral side of the ventricular part.
  • The human heart is four-chambered, two thin-walled auricles or atria and two thick-walled ventricles. In the right auricle there open two large vessels as superior and inferior vena cava. It also receives a small coronary sinus from the posterior side. Some left auricle receives 4 pulmonary veins of the lungs.
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Image Source ~ Crafted With ©Ishwaranand - 2020 ~ Image by ©Ishwaranand
  • The two ventricles are left and right Ventricles. The pulmonary aorta arises from the right ventricle and systemic aorta arise from the left ventricle.
  • From the systemic aorta left and right coronary artery arises which supplies oxygenated blood to the wall of the heart and the deoxygenated blood from the heart is collected by coronary sinus.

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