Umbilical vesicle Meaning, Definition & Usage
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noun membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
vesicula umbilicus; vitelline sac; yolk sac.
WordNet
Definitions
(Anat.) , a saccular appendage of the developing embryo, containing the nutritive and unsegmented part of the ovum; the yolk sac. See Illust. in Appendix.
