1. umbilical vesicle

noun. Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional.
Synonyms
vesicula umbilicus vitelline sac yolk sac sac

2. umbilical

noun. (əmˈbɪlɪkəl) Membranous duct connecting the fetus with the placenta.
Synonyms
conceptus canal fetal membrane vena umbilicalis fetus embryo foetus umbilical cord funiculus channel duct epithelial duct umbilical vein fertilized egg
Antonyms
take away
Etymology
umbilical (English)
umbilicus (Latin)

3. vesicle

noun. (ˈvɛzɪkəl) A small anatomically normal sac or bladderlike structure (especially one containing fluid).
Synonyms
bleb blister tear sac dacryocyst bulla lacrimal sac cyst Golgi apparatus follicle Golgi body Golgi complex liposome dictyosome sac
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