| mesocardium | <embryology> The double layer of splanchnic mesoderm supporting the embryonic heart in the pericardial cavity. It disappears before birth. Dorsal mesocardium, the part of the mesocardium dorsal to the embryonic heart; it breaks down to form the transverse sinus of the pericardium. Ventral mesocardium, the part of the mesocardium ventral to the embryonic cardiac tube; transitory in all vertebrates; in the higher mammals, it breaks through as soon as its component layers of epicardium make contact with each other. Origin: meso-+ G. Kardia, heart (05 Mar 2000) |
|---|