The Heart part 1
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the heart lies in this anatomical region that extends from the sternum to the vertebral column, the first rib to the diaphragm and between the lungs
the pointed part of the heart is formed by the tip of the left ventricle and rests on the diapragm
is the hearts posterior surface. it is formed by the atria (upper chambers) of the heart, mostly the left atrium
is deep to the sternum and ribs
is the part of the heart between the apex and right border and rests mostly on the diaphragm
right and left borders
the right faces the right lung and extends from the inferior surface to the base. The left faces the left lung and extends from the base to the apex
the membrane that surrounds and protects the heart. It confines the heart to its position in the mediastinum, while allowing sufficient freedom of movement for vigorous and rapid contraction.
is composed of tough, inelastic, dense irregular connective tissue. It resembles a bag that rests on and attaches to the diaphragm. It prevents outstretching of the heart, provides protection and anchors the heart in the mediastinum
is deeper and thinner, more delicate membrane that forms a double layer around the heart.
found between the parietal and visceral layers of the serous pericardium is a thin film of lubricating serous fluid which is slippery secretion of the pericardial cells. It reduces friction between the layers of the serous pericardium as the heart moves.
the external layer of the heart wall it is thin and transparent and composed of mesothelium and delicate connective tissue that imparts a smooth, slippery texture to the outermost surface of the heart.
the middle layer of the heart wall, which is cardiac muscle tissue, makes up about 95% of the heart and is responsible for its pumping action. The cardiac muscle is involuntary. Its muscle fibers swirl diagonally around the heart in bundles
the innermost layer of the heart wall. It is a thin layer of endothelium overlying a thin layer of connective tissue. It provides a smooth lining for the chambers of the heart and covers the valves of the heart. It minimizes surface friction as blood passes through the heart and blood vessels.
the two superior receiving chambers
the two inferior pumping chambers
on the anterior surface of each atrium is wrinkled pouch like structure. Each one slightly increases the capacity of an atrium so that it can hold more blood.
are on the surface of the heart. A series of grooves that contain coronary blood vessels and a variable amount of fat. Each sulcus marks the external boundary between two chambers of the heart.
the right atrium
forms the right border of the heart and receives blood from three veins.
between the right atrium and the left atrium is a thin partition
blood passes from the right atrium into the right ventricle through a valve that is called this. Because it consists of three leaflets or cusps
forms most of the anterior surface of the heart.
the cusps of the tricuspid valve are connected to tendon like cords, which in turn are connected to cone shaped trabeculae cornea called papillary muscles
coned shaped trabeculae cornea
internally the right ventricle is separated from the left ventricle by this partition
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