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a transitory dilation in the embryonic heart where the arterial trunk joins the ventral roots of the aortic arches.
Farlex Partner Medical Dictionary © Farlex 2012
In the embryo, the segment of the heart tube destined to be partitioned and to form the two ventricular outflow segments, to the aorta on the left and to the pulmonary trunk on the right.
See also: bulbus
Medical Dictionary, © 2009 Farlex and Partners