<unk> s are commonly used in the neonatal period for vascular access. An<unk>  passes through the umbilicus,<unk>  vein, left portal vein, ductus venosus, middle or left hepatic vein, and inferior vena cava to the junction of the inferior vena cava with the right atrium. In contrast, the typically paired, bilateral<unk>  arteries initially course caudally to enter the right and left iliac arteries. Therefore, the<unk>  and the<unk>  artery catheter can be easily distinguished on abdominal radiographs. The<unk>  predominantly follows an anterior and cephalad course in the midline<unk>  vein until directed posteriorly in the liver. The<unk>  artery catheter is initially directed caudally and posteriorly to enter either the right or left iliac artery before coursing superiorly in the more posteriorly positioned aorta. The preferred location of the tip of the<unk>  is typically in the cephalad portion of the inferior vena cava or at the inferior vena caval–right atrial junction.
Umbilical venous catheter
Umbilical arterial catheter
Transposition of the great vessels diagram
Percutaneous umbilical cord blood sampling
Central venous catheter
Fetal surgery
Umbilical cord
Cord blood