Posted by CB on September 02, 2011 at 06:03:52:
In Reply to: Vasculature posted by Dr. Lazarus on August 31, 2011 at 17:19:38:
: Describe the relationship of the duodenum to the portal vein in the adult and relay the developmental steps that lead to this adult relationship. The duodenum develops as the straight caudal part of the foregut. The vitelline veins (which drain the yolk sac)run parallel to the duodenum. Anastomoses form between these two branches- the first ventral (anterior), the second dorsal (posterior), and the third is ventral again. The first and third degenerate, leaving only the branch posterior. At this point, as the duodenum The right vitelline vein becomes our portal vein, but these anastomoses contribute to the portal vein (and the other veins that drain into it. The duodenum elongates and it forms it characteristic C shape. In doing so, the branch that originally ran transversely across the longitudinal cord is not at the opposite angle (running longitudinally posterior to the first part of the duodenum.
: T/F
: 1. 4th pharyngeal arch arteries gives rise to the Left Subclavian. False- aortic arch.
: 2. The right vitelline veins become hepatic sinusoids. False- it forms the portal vein.
: 3. The IVC is formed by anterior cardinal, posterior cardinal, and superior cardinal. False- it is formed by the posterior cardinal, superior and inferior cardinal veins.