A newborn baby has projectile vomiting sholy after each feeding. After investigations you have determined that there is obstruction of the digestive tract as a result of an annular pancreas. Annular pancreas is an abnormality in which of the following developmental processes?
The ventral pancreatic bud normally rotates around the duodenum to fuse with the dorsal pancreatic bud. Both pancreatic buds form from evaginations from the second pa of the duodenum, hence the rotation is around the second pa of the duodenum. The normal rotation is around the right side of the embryonic duodenum. Annular pancreas results from the ventral pancreatic bud dividing and rotating around both the right and left sides of the second pa of the duodenum, thus encircling it. The dorsal pancreatic bud does not rotate around the duodenum and therefore is not the cause of annular pancreas. The ventral pancreatic bud does not form from the first pa of the duodenum and therefore does not rotate around this pa of the duodenum.
Rotation of the dorsal pancreatic bud around the first pa of the duodenum
Rotation of the dorsal pancreatic bud around the second pa of the duodenum
Rotation of the dorsal pancreatic bud around the third pa of the duodenum
Rotation of the ventral pancreatic bud around the second pa of the duodenum