epicardium

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epicardium

[‚ep·ə′kärd·ē·əm]
(anatomy)
The inner, serous portion of the pericardium that is in contact with the heart.
(invertebrate zoology)
A tubular prolongation of the branchial sac in certain ascidians which takes part in the process of budding.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.