Superior Presentation of the Pancreatic Neck Structure

Description

Arising between the pancreatic head on the right and the pancreatic body to the left, the pancreatic neck (collum pancreatis, isthmus) forms a short, slender bridge that lies posterior to the pylorus and first part of the duodenum. From a superior perspective, the prepancreatic plane is apparent, with the anterior surface of the gland facing the lesser sac and the posterior surface approaching the portal venous confluence. The neck typically overlies the junction where the superior mesenteric vein ascends to meet the splenic vein, forming the portal vein just posterior to the pancreatic parenchyma. Small arterial branches from the dorsal pancreatic and pancreaticoduodenal arcades course nearby, while the main pancreatic duct trends from tail to head within the substance of the gland. Surgeons care about this segment because it is the usual transection site in pancreaticoduodenectomy, where safe division demands respect for the portal vein and superior mesenteric vein immediately posterior to the neck. Bleeding at the portal confluence, or a postoperative pancreatic fistula from the cut surface and duct, often traces back to how the neck is handled. Acute pancreatitis and locally advanced pancreatic adenocarcinoma can also tether or encase these adjacent veins at the isthmus, changing resectability and dictating whether venous resection and reconstruction is needed. Use this superior view for teaching pancreatic parts and peritoneal relationships in abdominal anatomy and GI surgery modules, and for illustrating operative reports, textbooks, or journal figures describing pancreatic neck transection, portal vein exposure, or SMV-splenic vein confluence anatomy. It also fits radiology teaching files when correlating axial CT or MR landmarks at the pancreatic isthmus with the portal venous axis. Anatomical accuracy verified by SciePro's Medical Advisory Board.