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Position Nine (9) inches long x three (3) inches wide. Located within the mediastinum , bordered laterally by the lungs, Posteriorly by the backbone, Anteriorly by the sternum, ribs and intercostal muscles.

Layers of the heart:

Layers of the heart Made up of three (3) distinct layers: Outer Preicardium Middle pericardium Inner endocardium

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Pericardium The heart and the proximal ends of the large blood vessels are enclosed by the pericardium Consists of an outer fibrous bag-- fibrous pericardium which surrounds a more delicate double-layered sac. Inner layer of this sac-- visceral pericardium ( epicardium ) covers the heart. Between the parietal and visceral layers is the pericardial cavity which contains serous fluid-- pericardial fluid . The fluid reduces friction between the pericardial membranes when the heart moves within them.

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Myocardium Relatively thick. Consists largely of cardiac muscle tissue responsible for forcing blood out of the heart chambers. Muscle fibers are arranged in planes, separated by connective tissues that are richly supplied with blood capillaries, and nerve fibers. Endocardium Lines the chambers of the heart. Composed of epithelial cells.

Interior of heart:

Interior of heart

Circulation of Blood :

Circulation of Blood Described in two parts Pulmonary circulation Systemic circulation

Pulmonary circulation:

Pulmonary circulation The circulation of blood from the Rt. Ventricle of heart to the lungs and back to the Lt. atrium.

Systemic Circulation:

Systemic Circulation Blood pumped from the Lt. ventricle is carried by the branches of aorta around the body and returns to the Rt. Atrium by inferior and superior venae cavae.

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Thoracic aorta Abdominal aorta

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Thoracic Aorta

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