True statement regarding portal venous system:
Whole system is valve less
Valves are present at the junction of superior mesenteric artery and splenic artery
Valves are present in the intrahepatic system
There are about 10-12 valves along the entire course
Ans. (a) Whole system is valve lessRef BDC 4th ed. Vol. 11/268-71, Gray's 39th ed /1218-19* In adults, the portal vein and its tributaries have no valves.* In fetal life and for a short postnatal period valves are demonstrable in its tributaries, but they usually gets atrophied.* Rarely some persist in an atrophic form into adulthood.
Blood Vessels of Abdomen and Pelvis