Upper Gastrointestinal Tract Flashcards
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Read the first 6 Upper Gastrointestinal Tract flashcards as text
A surgeon performing an emergency procedure needs to clamp the structures within the hepatoduodenal ligament to control bleeding from the liver. Which of the following structures would be occluded by this maneuver?
Answer: Hepatic artery proper, hepatic portal vein, and common bile duct
The hepatoduodenal ligament contains the portal triad, which consists of the hepatic artery proper, the hepatic portal vein, and the common bile duct. [5] This maneuver, known as the Pringle maneuver, is used to control hepatic bleeding by temporarily occluding these vessels.
A patient is diagnosed with a peptic ulcer in the first part of the duodenum (duodenal bulb). This region is unique because, unlike the other three parts of the duodenum, it is:
Answer: Intraperitoneal
The first part of the duodenum, specifically the proximal 2.5 cm known as the duodenal bulb or cap, is intraperitoneal, meaning it is covered by peritoneum. The remaining parts (descending, horizontal, and ascending) are retroperitoneal. [8]
The celiac trunk is the primary arterial supply to the foregut. Which of its three main branches provides the main arterial supply to the lesser curvature of the stomach and the abdominal part of the esophagus?
Answer: Left gastric artery
The celiac trunk has three main branches: the left gastric, common hepatic, and splenic arteries. The left gastric artery courses along the lesser curvature of the stomach and gives off esophageal branches to supply the abdominal part of the esophagus. [9, 16]
A patient with severe gastroesophageal reflux disease (GERD) undergoes an endoscopy. The physician notes an abrupt change in the epithelial lining at the Z-line (gastroesophageal junction). What is the normal histological transition observed at this junction?
Answer: Stratified squamous to simple columnar epithelium
The normal esophagus is lined with non-keratinized stratified squamous epithelium, which is protective against abrasion from food. The stomach is lined with simple columnar epithelium, specialized for secretion. The transition between these two types occurs at the gastroesophageal junction. [14, 17]
During a gastroscopy, a physician observes prominent longitudinal folds on the inner surface of an empty stomach. These folds, which allow the stomach to expand significantly after a meal, are known as:
Answer: Rugae
The internal surface of the stomach is characterized by gastric folds or rugae. These are folds of the mucosa and submucosa that are prominent when the stomach is empty and flatten out as the stomach distends with food, allowing for expansion. [4, 18, 29]
In a patient with liver cirrhosis, portal hypertension can cause venous blood to back up into the systemic circulation. Which vein, draining the abdominal part of the esophagus and being a tributary of the portal system, is a key site for the formation of esophageal varices?
Answer: Left gastric vein
The abdominal portion of the esophagus is drained by the left gastric vein, which is a tributary of the portal vein. [10] In portal hypertension, blood flow is impeded, causing a portosystemic anastomosis to form between the left gastric vein and the azygos system (which drains the thoracic esophagus). This leads to dilated, fragile veins known as esophageal varices.