vitelline sac


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Noun1.vitelline sac - membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functionalvitelline sac - membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
sac - a structure resembling a bag in an animal
References in periodicals archive ?
Embryonically, Ectopiacordisis a result of abnormal migration ofsplanchnic and somatic mesoderm and effects the development of the heart and the major vessels, with the premature rupture of the chorion or vitelline sac leading to a mid-line defect7.