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[Latin] Of or pertaining to the umbilicus; situated at or about the navel, as U. region (of the abdomen), U. hernia, U. cord (funis umbilicalis), the cord connecting the placenta of the mother with the umbilicus of the child; composed of the two U. arteries and the U. vein enclosed in a mass of gelatinous mucous tissue (gelatin of Wharton); originally also containing another umbilical vain and the duct of the umbilical vesicle. See Fetal circulation (under Circulation). U. vesicle, that portion of the yolk-sac which remains outside of the body of the embryo and is connected with it by a passage (omphalo-mesenteric duct, U. duct) entering the body by an opening which corresponds to the future umbilicus. It represents the nutritive part of the ovum, which during the first few week of fetal life supports the developing part or embryo, and which then atrophies.

[Latin]Of, for, or produced within the u. cord or vessels. U. fissure, that part of the longitudinal fissure of the liver lying in front of the transverse fissure, lodging the u. vein. U. souffle, see Souffle.