 This is a supine cadaver. I am demonstrating from the right side and I am holding the camera. This is going to be a dissection and demonstration of the deep epigastric region. So therefore, we have removed the stomach. We have removed the small intestine and we have removed the large intestine from here. So to bring you up to speed, we have here in front of us, this is the sea loop of the diodenum that we can see here. Stuck inside the sea loop of the diodenum, this is the pancreas. Straight away you would have noticed something. You will notice that this whole portion is completely black. Apparently, this cadaver during life had suffered from necrotizing pancreatitis. This is the inferior part of the liver and we have reflected up the lesser momentum here. So this structure that I have lifted up here, this is the cut portion of the first part of the diodenum. The first inch of the first part of the diodenum is intraperitoneal. The rest of the diodenum is retroperitoneal. So this is the supia part of the diodenum. This is the descending part of the diodenum. This is the transverse part of the diodenum and it goes under the supia mesentric muscles and this is the ascending part of the diodenum and this is the dj flexure. And from here, it becomes intraperitoneal as the gijinum. So these are the parts of the diodenum that we can see here. This is the other dissection in another cadaver to show the interior of the diodenum, the tappel of batter and the process called ERCP. This is the supine cadaver. I am directing from the right side. The camera person is also on the right side. We have completely eviscerated the diodenum, the pancreas and the spleen with their accompanying blood vessels from the location but we have kept it inside too. This is the first part of the diodenum. This is the descending part, second part. This is the horizontal third part. This is the ascending fourth part and this is the diodenogiginal flexure. This is the pancreas and we can see that the head and the muscles of the pancreas is completely necrosed in this particular cadaver. In life, perhaps, he had suffered from necrotizing pancreatitis and that's the reason why even the adjacent part of the diodenum is discolored and black. This is the neck of the pancreas. This is the body of the pancreas and the body of the pancreas is abutting against the hyalum of the spleen, which I shall describe later on. We have cannulated the common bile duct here and we have opened out the diodenum and that is what we are going to demonstrate. Now I am opening out the cut portion of the diodenum here and you can see, first of all, the mucosa of the diodenum. I have inverted it out and you can see that the first part of the diodenum, the mucosa is smooth. From the second part onwards, the mucosa becomes rucose and these are the horizontal folds of the diodenal mucosa and this is how it continues throughout the rest of the diodenum and we can see that here. This is cannula which has gone through the common bile duct here and we can see it is passing behind the diodenum. When we push the cannula through the common bile duct, we can see it has come into the ampoule of water here and it is coming out through the opening into the second part of the diodenum. This opening and the papilla of water marks the junction between the foregut and the midgut part of the diodenum. This is the foregut part, this is the midgut part. If you were to take a close look at the mucosa here, we see a characteristic pattern of the mucosa in this particular region. Above this opening, the mucosa is forming a curved portion and that is called the hood and below the opening, the mucosa is longitudinal. So this hood and the longitudinal fold of mucosa is an important landmark which is used during endoscopy to locate the ampoule of water and it is through this opening that the cannula is inserted to do the procedure which is known as endoscopic retrograde cholangio pancreatogram to study the pancreatic system as well as the biliary system for strictures, stones, etc. And it is through the same opening that endoscopist can do endoscopic synchrotomy in case there is a stricture of the papilla of water. This is an endoscopic retrograde cholangio pancreatogram to show the biliary and the pancreatic tubs. Thank you very much for watching Dr. Sanjay Sanyar. Sanyar, please like and subscribe. If you have any questions or comments, please put them in the comment section below. Have a nice day.