mesocardium

noun
me·​so·​car·​di·​um | \-ˈkärd-ē-əm \

Medical Definition of mesocardium 

1 : the transitory mesentery of the embryonic heart

2 : either of two tubular prolongations of the epicardium that enclose the aorta and pulmonary trunk and the venae cavae and pulmonary veins

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