What is the smooth layer which lines each heart chamber called whats the outer ,inner ,called ple anyone?

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http://www.google.co.uk/search?hl=en%26amp;q=h鈥?/a>What is the smooth layer which lines each heart chamber called whats the outer ,inner ,called ple anyone?
The inner layer is the endocardium. This is the thin smooth lining of the chambers of the heart.