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The heart

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atrium, pl. atria
each of the two upper cavities of the heart from which blood is passed to the ventricles
each of the two main lower chambers of the heart, left and right
vena cava
a large vein carrying deoxygenated blood into the heart.
The main artery in the body that passes over the heart from the left ventricle and runs down in front of the backbone.
atrioventricular valves
Valves situated between the atria and the ventricles that prevent backflow from the ventricles into the atria during systole.
semilunar valves
The aortic and the pulmonary valves are located at the base of the aorta and the pulmonary trunk or artery, and the aorta, and permit blood to be forced into the arteries, and prevent backflow from the arteries into the ventricles.
the thin, smooth membrane which lines the inside of the chambers of the heart and forms the surface of the valves.
The middle layer of the heart, consisting of cardiac muscle.
a serous membrane that forms the innermost layer of the pericardium, attached to the muscles of the wall of the heart.
a layer of connective tissue that covers each muscle FASCICLE