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Fibrillation
Involuntary recurrent contraction of a single muscle fiber or of an isolated bundle of nerve fibers. Fibrillation of a chamber of the heart results in inefficient random contraction of that chamber and disruption of the normal sinus rhythm of the heart. Fibrillation is usually described by the part that is contracting abnormally, such as atrial fibrillation or ventricular fibrillation.

Great Vessels
The large arteries and veins arising from the heart and pericardium.

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