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| Front | Back |
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Heart is located at
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In the mediastinum between second rib and fifth intercoastal space
on the superior surface of the diaphram two thirds of the left of the midsteral lineanterior to the vertebral column posterior to the sternum |
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The heart is enclosed in?
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Pericardium a double walled sac
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Superficial fibrous pericardium
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Protects achors and prevents overfililling
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The paietal layer lines the?
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The internal surface of te fibrous pericardium
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The visceral layer is
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(epicardium) on the external surface of the heart separated by fluid filled pericardial cavity ( decrease friction)
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Layers of the heart wall
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Epicardium
2.myocardium 3.edocardium |
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Epicardium
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Visceral layer of the serous pericardium
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Myocardium
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Spiral bundles of cardiac muscle cells
fibrous skeleton of the heart crisscrossing interlacing layer of connecttive tissue |
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Fibrous skeleton of the heart
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Crisscrossing interlacing layer of connective tissue
anchors cardiac muscle fibers supports great vessels and valves limits spread of action potentialsto specific paths |
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Endocardium
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Is continyous with edothelial lining of blood vesssels
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Four chambers
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Two atria and two ventricles
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Two atria
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Separated internally by the interatrial septum
coronary sulcus (atrovetricular groove) encircles the junction of the artria and ventricles auricles increase atrial volume |
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Two ventricles
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Separated by the interventricular septum
anterior and posterior interventricular sulci mark the position of the septum externally |
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Atria the receiving chambers
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Walls are ridged by pectinate muscles
vessels entering right atrium vessls entering left atrium |
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Vessels entering right atrium
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Superior vena cava
inferior vena cava coroary sinus |
