Urachus is the remnant of: (A) Allantois, (B) Meckel's diveiculum, (C) Umbilcal aery, (D) Left umbilical vein
Answer is A. xThe developing bladder is continuous cranially with the allantois.it is unceain whether the allantois contributes to the formation of the bladder .the allantois atrophies and is seen in postnatal life as a fibrous band the urachus extending from the apex of bladder to umbilicus Ref Human embryology Inderbier Singh Tenth edition Page no 292