Anatomy (Structure) of Heart in Hindi | Bhushan Science

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Heart Anatomy
Approximately the size of your fist
Location
Superior surface of diaphragm
Left of the midline
Anterior to the vertebral column, posterior to the sternum
Coverings of the Heart: Anatomy
Pericardium – a double-walled sac around the heart composed of:
A superficial fibrous pericardium
A deep two-layer serous pericardium
The parietal layer lines the internal surface of the fibrous pericardium
The visceral layer or epicardium lines the surface of the heart
They are separated by the fluid-filled pericardial cavity
The Function of the Pericardium:
Protects and anchors the heart
Prevents overfilling of the heart with blood
Allows for the heart to work in a relatively friction-free environment
Heart Wall
Epicardium – visceral layer of the serous pericardium.
Myocardium – cardiac muscle layer forming the bulk of the heart.
Fibrous skeleton of the heart – crisscrossing, interlacing layer of connective tissue.
Endocardium – endothelial layer of the inner myocardial surface.
Atria are the receiving chambers of the heart
Each atrium has a protruding auricle
Pectinate muscles mark atrial walls
Blood enters right atria from superior and inferior venae cavae and coronary sinus
Blood enters left atria from pulmonary veins
Ventricles are the discharging chambers of the heart
Papillary muscles and trabeculae carneae muscles mark ventricular walls
Right ventricle pumps blood into the pulmonary trunk
Left ventricle pumps blood into the aorta

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