Nuchal CordUmbilical CordNeckFetal BloodSpinal CordUmbilical VeinsUmbilical ArteriesSpinal Cord InjuriesCord Blood Stem Cell TransplantationUltrasonography, PrenatalPregnancyHead and Neck NeoplasmsUltrasonography, Doppler, ColorObstetric Labor ComplicationsPregnancy Trimester, ThirdGestational AgePregnancy Trimester, FirstHernia, UmbilicalPregnancy OutcomeNeck PainUrachal CystInfant, NewbornBlood BanksWharton JellySpinal Cord DiseasesHuman Umbilical Vein Endothelial CellsUmbilicusSpinal Cord CompressionCells, CulturedMesenchymal Stromal CellsSensitivity and SpecificityAntigens, CD34Predictive Value of TestsSpermatic CordProspective StudiesNeck InjuriesMaternal-Fetal ExchangeFetusSpinal Cord NeoplasmsHematopoietic Stem CellsPlacentaFetal HypoxiaEndothelium, VascularSpinal Cord IschemiaCell Differentiation