ABDOMINAL VISCERA

Extraperitoneal fascia

Definitions Peritoneum: (like pleura, pericardium) Intraperitoneal Primarily retroperitoneal Secondarily retroperitoneal

Intra/retropritoneal

Definitions Mesenteries: Dorsal, ventral Mesogastrium, mesointestine, mesocolon Omentums , ligaments

Dorsal, ventral Mesentery

Definitions Mesenteries: Dorsal, ventral Mesogastrium, mesointestine, mesocolon Omentums , ligaments

Mesogastrium, mesointestine, mesocolon

Definitions Mesenteries: Dorsal, ventral Mesogastrium, mesointestine, mesocolon Omentums , ligaments

Lesser omentum from ventral mesentery

greater omentum from dorsal mesentery

the superior part (first part) extends from the pyloric orifice of the stomach to the neck of the gallbladder, is just to the right of the body of vertebra LI, and passes anteriorly to the bile duct, gastroduodenal artery, portal vein, and inferior vena cava-clinically, the beginning of this part of the duodenum is referred to as the ampulla or duodenal cap, and most duodenal ulcers occur in this part of the duodenum; the descending part (second part) of the duodenum is just to the right of midline and extends from the neck of the gallbladder to the lower border of vertebra LIII-its anterior surface is crossed by the transverse colon, posterior to it is the right kidney, and medial to it is the head of the pancreas-this part of the duodenum contains the major duodenal papilla, which is the common entrance for the bile and pancreatic ducts, and the minor duodenal papilla, which is the entrance for the accessory pancreatic duct, and the junction of the foregut and the midgut just below the major duodenal papilla; the inferior part (third part) of the duodenum is the longest section, crossing the inferior vena cava, the aorta, and the vertebral column (Figs. 4.61B and 4.62)-it is crossed anteriorly by the superior mesenteric artery and vein; the ascending part (fourth part) of the duodenum passes upward on, or to the left of, the aorta to approximately the upper border of vertebra LII and terminates at the duodenojejunal flexure

This duodenojejunal flexure is surrounded by a fold of peritoneum containing muscle fibers called the suspensory muscle (ligament) of duodenum (ligament of Treitz).