After bih Ductus Venosus anatomically closes by: (A) 10 to 96 hours, (B) < 1week, (C) 2 to 3 weeks, (D) > 4 weeks
Answer is C. The ductus venosus constricts by 10 to 96 hours after bih and is anatomically closed by 2 to 3 weeks, resulting in the formation of the ligamentum venosum.Reference: William&;s Obstetrics; 24th edition; Chapter 7; Embryogenesis and Fetal Morphological Development