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(anatomy) The structure of splanchnic mesoderm that supports the embryonic heart in the pericardial cavity. In the adult, it refers to any one of two tube-like prolongations of the epicardium. One encloses the aorta and pulmonary trunk and the second all pulmonary veins.
Related-word data is supplemented by the Datamuse API. Datamuse results are suggestions, not automatic replacements.