Presentation on theme: "DEPARTMENT OF ANATOMY ABDOMEN. Esophagus The abdominal oesophagus The abdominal oesophagus measures approximately 1.25 cm in length. Phrenicoesophageal."— Presentation transcript:
Barrett's esophagus The normal squamous epithelium lining of the esophagus is replaced by metaplastic colum nar epithelium.squamous epitheliumcolum nar epithelium
Nerves of abdominal esophagus The right and left vagus nerves (CN X) divide into branches that form the esophageal plexus around the inferior esophagus. Anterior and posterior gastric branches of the plexus accompany the esophagus through the esophageal hiatus for distribution to the anterior and posterior aspects of the stomach.
The stomach is the most dilated part of the gastrointestinal tract and has a J-like shape. Positioned between the abdominal esophagus and the small intestine, the stomach is in the epigastric, umbilical, and left hypochondrium regions of the abdomen. It stores food (in the adult it has a capacity of about 1500 mL), it mixes the food with gastric secretions to form a semifluid chyme, and it controls the rate of delivery of the chyme to the small intestine so that efficient digestion and absorption can take place.
Parts of the Stomach Has two openings: Cardiac and pyloric orifices Two curvatures: Greater and lesser curvatures Two surfaces: Anterior and a posterior surface
The stomach is divided into four regions 1. Cardia 2. Fundus of stomach 3. Body of stomach 4. Pyloric part: which is divided into the pyloric antrum and pyloric canal and is the distal end of the stomach
Interior of the Stomach When contracted, the gastric mucosa is thrown into longitudinal ridges called gastric folds, or gastric rugae, they are most marked toward the pyloric part and along the greater curvature.
Hiatal Hernia 1.Paraesophageal hiatal hernia:the cardia remains in its normal position, however, a pouch of peritoneum, often containing part of the fundus, extends through the esophageal hiatus 2.Sliding hiatal hernia:the abdominal part of the esophagus, the cardia, and parts of the fundus of the stomach slide superiorly through the esophageal hiatus into the thorax
Blood supply The arterial supply to the stomach is exclusively from branches of the celiac artery. Venous drainage is to the portal system
Celiac trunk The celiac trunk is the anterior branch of the abdominal aorta supplying the foregut. It arises from the abdominal aorta immediately below the aortic hiatus of the diaphragm anterior to the upper part of vertebra LI. It immediately divides into the left gastric, splenic, and common hepatic arteries.
Veins of stomach and duodenum Venous drainage from the stomach and duodenum is into the portal vein, either directly or indirectly via the splenic or superior mesenteric vein (SMV). The splenic vein usually receives the inferior mesenteric vein and then unites with the SMV to form the portal vein.
The right and left gastric veins drain into the portal vein. short gastric veins and left gastro-omental veins drain into the splenic vein. The right gastro-omental vein empties in the SMV.
Nerve supply Parasympathetic The anterior and posterior vagal trunks arise from the oesophageal plexuses and enter the abdomen through the oesophageal hiatus. The hepatic branches of the anterior vagus pass to the liver.
The coeliac branch of the posterior vagus passes to the coeliac ganglion from where it proceeds to supply the intestine down to the distal transverse colon. The anterior and posterior vagal trunks descend along the lesser curve as the anterior and posterior nerves of Latarjet from which terminal branches arise to supply the stomach,
The sympathetic nerve supply of the stomach from the T5 through T9 segments of the spinal cord passes to the celiac plexus through the greater splanchnic nerve. Sympathetic
Peptic Ulcer A peptic ulcer is a hole in the gut lining of the stomach, duodenum, or esophagus. A peptic ulcer of the stomach is called a gastric ulcer; of the duodenum, a duodenal ulcer; and of the esophagus, an esophageal ulcer. An ulcer occurs when the lining of these organs is corroded by the acidic digestive juices which are secreted by the stomach cells. >80% involve Helicobacter pylori
Complications of Peptic ulcer 1.Gastro intestinal bleeding 2. Perforation 3. Cancer Perforation Lesser curvature : Erosion of gastric artery (R & L) Posterior Surface of stomach : Splenic artery Posterior wall of 1st part of duodenum : Gastroduodenal artery
Vagotomy(surgical section of the vagus nerves) is performed in some people with chronic or recurring ulcers to reduce the production of acid A truncal vagotomy (surgical section of the vagal trunks) is rarely performed because the innervation of other abdominal structures is also sacrificed A selective proximal vagotomy :attempts to denervate even more specifically the area in which the parietal cells are located