#1
Which part of the duodenum is most commonly involved in duodenal ulcers?
First part (duodenal cap)
ExplanationThe first part, or duodenal cap, is the most common site for duodenal ulcers.
#2
Which anatomical landmark demarcates the transition from the duodenum to the jejunum?
Duodenojejunal flexure
ExplanationThe duodenojejunal flexure demarcates the transition from the duodenum to the jejunum.
#3
Which part of the duodenum is retroperitoneal?
Second part (descending)
ExplanationThe second part, or descending part, of the duodenum is retroperitoneal.
#4
Which hormone stimulates the contraction of the gallbladder to release bile into the duodenum?
Cholecystokinin (CCK)
ExplanationCholecystokinin (CCK) stimulates the contraction of the gallbladder to release bile into the duodenum.
#5
Which of the following structures is NOT located in the duodenal wall?
Duodenal papilla
ExplanationThe duodenal papilla is not located in the duodenal wall.
#6
Which artery supplies the first part of the duodenum?
Celiac artery
ExplanationThe celiac artery supplies blood to the first part of the duodenum.
#7
Which of the following structures does NOT drain into the second part of the duodenum?
Accessory pancreatic duct
ExplanationThe accessory pancreatic duct does not drain into the second part of the duodenum.
#8
What is the primary function of the duodenal mucosa?
Protection against acidic gastric contents
ExplanationThe duodenal mucosa primarily protects against acidic gastric contents.
#9
Which nerve supplies parasympathetic innervation to the duodenum?
Vagus nerve (CN X)
ExplanationThe vagus nerve (CN X) supplies parasympathetic innervation to the duodenum.
#10
What is the function of Brunner's glands found in the duodenum?
Production of mucus
ExplanationBrunner's glands in the duodenum produce mucus.
#11
Which of the following is NOT a part of the arterial blood supply to the duodenum?
Inferior mesenteric artery
ExplanationThe inferior mesenteric artery is not part of the arterial blood supply to the duodenum.
#12
Which hormone stimulates the secretion of bile from the liver into the duodenum?
Cholecystokinin (CCK)
ExplanationCholecystokinin (CCK) stimulates the secretion of bile from the liver into the duodenum.
#13
Which layer of the duodenal wall contains the submucosal (Brunner's) glands?
Submucosa
ExplanationThe submucosa layer of the duodenal wall contains Brunner's glands.
#14
Which of the following structures is NOT located within the duodenal papilla?
Accessory pancreatic duct
ExplanationThe accessory pancreatic duct is not located within the duodenal papilla.
#15
Which nerve provides sympathetic innervation to the duodenum?
Greater splanchnic nerve (T5-T9)
ExplanationThe greater splanchnic nerve (T5-T9) provides sympathetic innervation to the duodenum.
#16
Which lymphatic vessels drain lymph from the duodenum?
Thoracic duct
ExplanationThe thoracic duct drains lymph from the duodenum.