Abdomen Practice Questions

Q: The stomach derives its blood supply from all these arteries directly or indirectly, except for which one?

Superior mesenteric artery. ***Superior mesenteric artery*** - The **superior mesenteric artery (SMA)** primarily supplies the **midgut** derivatives (from the distal duodenum to the proximal two-thirds of the transverse colon), and does not directly or indirectly supply the stomach [2], [3]. - While it may communicate with branches of the celiac axis, it does not contribute to the stomach's vascularization. *Splenic artery* - The **splenic artery** is a direct branch of the celiac trunk and gives rise to the **short gastric arteries** and the **left gastroepiploic artery**, both of which supply the stomach. - The **short gastric arteries** supply the fundus of the stomach, and the **left gastroepiploic artery** supplies the greater curvature. *Hepatic artery* - The **common hepatic artery**, a branch of the celiac trunk, gives rise to the **gastroduodenal artery**, which then gives off the **right gastroepiploic artery** to the stomach’s greater curvature. - The proper hepatic artery then branches into the **right gastric artery**, which supplies the lesser curvature of the stomach. *Celiac axis* - The **celiac axis (celiac trunk)** is the main artery supplying the **foregut** and is the origin of the splenic artery, common hepatic artery, and left gastric artery, all of which directly or indirectly supply the stomach [1], [3]. - It is the primary arterial source for the stomach, spleen, liver, gallbladder, and part of the duodenum [3].

Q: Which artery dilatation causes compression of the 3rd part of the duodenum?

Superior mesenteric artery. Superior mesenteric artery - The superior mesenteric artery (SMA) originates from the aorta and passes anterior to the third part of the duodenum [1]. - Dilatation or an unusually acute angle between the SMA and aorta (the aortomesenteric angle) can compress the duodenum, leading to superior mesenteric artery syndrome. Gastroduodenal artery - The gastroduodenal artery typically runs posterior to the first part of the duodenum; its dilatation would not affect the third part. - It primarily supplies the pylorus, proximal duodenum, and head of the pancreas. Inferior mesenteric artery - The inferior mesenteric artery supplies the hindgut, including the distal colon and rectum, and is located far from the duodenum. - Its position makes it anatomically unlikely to cause direct compression of the duodenum. Celiac artery - The celiac artery branches superior to the duodenum and supplies the foregut organs such as the stomach, liver, and spleen. - It does not directly cross or lie in close proximity to the third part of the duodenum in a way that would cause compression if dilated [1].

Q: All of the following structures are related to the left ureter except which of the following?

Genitofemoral nerve. ***Genitofemoral nerve*** - The **genitofemoral nerve** (L1-L2) emerges from the psoas major muscle and descends on its anterior surface. - It divides into **genital and femoral branches** that supply the cremaster muscle and skin of the upper thigh. - The genitofemoral nerve runs on the **anterior surface of the psoas major**, while the ureter runs along the **tips of the transverse processes** posteriorly, separated by the psoas muscle. - There is **no consistent direct anatomical relationship** between the genitofemoral nerve and the ureter in their courses. *Root of the mesentery* - The **root of the mesentery** extends obliquely from the **duodenojejunal flexure** (left of L2) to the **right sacroiliac joint**. - It crosses the midline from **left to right**, passing over the left ureter in its course. - This represents a significant anatomical relationship with the left ureter. *Testicular vessels* - The **testicular/ovarian vessels** descend retroperitoneally and cross **anterior to the ureter** at the level of the **pelvic brim** [1]. - This is a well-established anatomical relationship known as "**water under the bridge**" (ureter passes under the vessels). - This relationship is clinically important during pelvic surgeries. *Sigmoid colon* - The **sigmoid colon** occupies the left iliac fossa and descends into the pelvis. - The left ureter passes **posterior and medial** to the sigmoid colon in the true pelvis. - This close relationship makes the left ureter vulnerable during sigmoid resections.

Q: In sepsis due to cholecystitis, which is the initial anatomical structure typically involved?

Quadrate lobe of liver. ***Quadrate lobe of liver*** - The **gallbladder fossa** is located on the visceral surface of the liver, directly bordered by the **quadrate lobe** (Couinaud segment IV). - In cases of cholecystitis progressing to sepsis with hepatic involvement, the **quadrate lobe** is the initial anatomical structure affected due to its **direct anatomical contact** with the gallbladder. - Pericholecystic inflammation and abscess formation typically extend first into the quadrate lobe parenchyma before involving other hepatic segments. *Right lobe of liver* - While the gallbladder is anatomically related to the right lobe, the **quadrate lobe** (though functionally part of the left hepatic territory) is the structure in **immediate contact** with the gallbladder fossa. - The right lobe proper (segments V-VIII) may be involved subsequently, but it is not the **initial** site of direct inflammatory spread. *Hepatic portal vein & IVC* - The **hepatic portal vein** and **inferior vena cava (IVC)** are not in direct anatomical contact with the gallbladder. - These vascular structures may be affected in advanced stages through septic thrombophlebitis (**pylephlebitis**) or hematogenous spread, but not as the **initial** anatomical site of local extension. *Left lobe of liver* - The **left lobe** (segments II and III) is anatomically distant from the gallbladder, separated by the falciform ligament and other structures. - It would not be the initial site of direct inflammatory spread from cholecystitis.

Q: What anatomical regions does the transpyloric plane separate?

Hypochondrium from lumbar region. ***Hypochondrium from lumbar region*** - The **transpyloric plane** is an imaginary horizontal line that passes through the **pylorus of the stomach** and the tips of the ninth costal cartilages. - This plane separates the **upper lateral abdominal regions** (hypochondria) from the **middle lateral abdominal regions** (lumbar regions) on each side. *Hypogastrium from hypochondrium* - The **hypogastrium** is inferior to the umbilical region, while the **hypochondria** are located in the upper lateral parts of the abdomen. - These regions are separated by the **subcostal plane**, not the transpyloric plane. *Iliac fossa from lumbar region* - The **iliac fossa** is located in the lower lateral part of the abdomen, while the **lumbar region** is in the middle lateral part. - These specific regions are primarily divided by the **intertubercular plane**, which is inferior to the transpyloric plane. *Umbilical region from lumbar region* - The **umbilical region** is the central area of the abdomen around the umbilicus, and the **lumbar regions** are lateral to it. - The transpyloric plane transverses the upper part of the umbilical region but does not primarily serve to separate the umbilical from the lumbar regions.

Q: The anterolateral surface of the left kidney is related to which of the following vessels?

Splenic vessels. ***Splenic vessels*** - The **splenic artery and vein** are the primary vascular structures related to the anterolateral surface of the left kidney [1]. - The **splenic artery** courses along the superior border of the pancreas and passes near the **superior pole and upper anterior surface** of the left kidney as it runs towards the spleen. - The **splenic vein** runs parallel and slightly inferior to the artery, also maintaining proximity to the kidney's anterior surface [1]. - This anatomical relationship is clinically important during **splenectomy, pancreatic surgery**, and in understanding **splenic vein thrombosis**. *Left colic vessels* - The **left colic artery** arises from the inferior mesenteric artery and supplies the descending colon and left colic flexure. - These vessels run within the **mesentery of the descending colon** and do not have a direct anatomical relationship with the anterolateral surface of the left kidney. - The left colic flexure (hepatic flexure) may be anterior to the lower pole of the left kidney, but the vessels themselves are not closely related to the kidney surface. *Both of the options* - This is incorrect because only the **splenic vessels** have a true anatomical relationship with the anterolateral surface of the left kidney. - The left colic vessels do not lie anterolateral to the kidney. *None of the options* - This is incorrect because the **splenic vessels** are definitively related to the anterolateral surface of the left kidney. - This is a well-established anatomical relationship described in standard anatomy textbooks.

Q: Right ovarian vein drains into which structure?

Inferior vena cava (IVC). ***Inferior vena cava (IVC)*** - The **right ovarian vein** in females (and the right testicular vein in males) drains directly into the **inferior vena cava (IVC)**. - This is a common anatomical drainage pattern for gonadal veins on the right side. *Right renal vein* - The **left ovarian vein** (and left testicular vein) drains into the **left renal vein**, not the right ovarian vein. - The right renal vein typically receives blood from the right kidney but not the right gonad. *Hemi azygos vein* - The **hemiazygos vein** is part of the azygos system, which drains the posterior thoracic and abdominal walls, not the gonads directly. - It primarily drains into the azygos vein, which then drains into the superior vena cava. *Inferior mesenteric vein* - The **inferior mesenteric vein** drains part of the large intestine (descending colon, sigmoid colon, and rectum). - It is part of the portal system and drains into the splenic vein or directly into the superior mesenteric vein.

Q: The tributaries of the inferior vena cava include all of the following, except:

Left gonadal vein. ***Left gonadal vein*** - The **left gonadal vein** (either testicular or ovarian) drains into the **left renal vein** before reaching the inferior vena cava. - It is **NOT a direct tributary** of the IVC, which is why it is the correct answer to this "except" question. - This anatomical arrangement distinguishes it from the **right gonadal vein**, which drains directly into the IVC. *Left renal vein* - The **left renal vein** is a **direct and major tributary** of the inferior vena cava (IVC). - It receives blood from the **left gonadal vein** and the **left suprarenal vein** before emptying into the IVC. [1] - This vein crosses anterior to the aorta to reach the IVC. *Hepatic vein* - The **hepatic veins** (typically three major veins: right, middle, and left) drain blood from the liver **directly into the IVC**. - They are essential for returning filtered blood from the liver to the systemic circulation. [2] - These veins have a very short course before entering the IVC just below the diaphragm. *Right suprarenal vein* - The **right suprarenal vein** drains **directly into the IVC**, similar to the right gonadal vein. [3] - In contrast, the **left suprarenal vein** drains into the left renal vein (indirect tributary), following the same asymmetric pattern as the gonadal veins.

Q: Which of the following structures is separated from the left kidney by a peritoneal layer?

Jejunum. ***Jejunum*** - The **jejunum**, being part of the intraperitoneal small intestine, is separated from the left kidney by a layer of **peritoneum** as it lies anterior to the kidney. - While the left kidney is retroperitoneal, the jejunum is intraperitoneal and separated by the **peritoneum** that lines the posterior abdominal wall. - This is the **most consistent and complete peritoneal separation** among the options. *Pancreas* - The **pancreas** (tail and body) lies anterior to the left kidney and is **retroperitoneal** [1]. - It is not separated from the left kidney by a peritoneal layer; instead, it is situated in the **anterior pararenal space** along with the kidney [1]. - Only the anterior surface of the pancreas is covered by peritoneum. *Splenic flexure* - While the **splenic flexure** is intraperitoneal and technically has peritoneum between it and the kidney, it often has **direct contact** with the kidney's lower pole via peritoneal reflections [2]. - The **phrenicocolic ligament** creates a shelf-like structure that can bring the splenic flexure into close proximity with the kidney. - The peritoneal separation is **less consistent** compared to the jejunum, making it a less ideal answer. *Splenic vessels* - The **splenic vessels** (artery and vein) run along the superior border of the pancreas, anterior to the left kidney, within the **retroperitoneal space** [1]. - These vessels are located in the **anterior pararenal space** and are not separated from the kidney by peritoneum [1].

Q: All are tributaries of the portal vein except which of the following?

Inferior pancreatoduodenal vein. ***Inferior pancreatoduodenal vein*** - The **inferior pancreatoduodenal vein** drains into the **superior mesenteric vein**, not directly into the portal vein. - It is part of the portal venous system but is **not a direct tributary** of the hepatic portal vein itself. - This is the correct answer as it does not drain directly into the portal vein. *Left gastric vein* - The **left gastric vein** (coronary vein) is a **direct tributary** of the hepatic portal vein. - It drains blood from the lesser curvature of the stomach and distal esophagus. - It joins the portal vein directly near the porta hepatis. *Right gastric vein* - The **right gastric vein** is also a **direct tributary** of the hepatic portal vein. - It drains the lesser curvature of the stomach and pyloric region. - It typically joins the portal vein directly or occasionally joins the superior mesenteric vein. *Superior mesenteric vein* - The **superior mesenteric vein** is one of the **two main formative vessels** (along with the splenic vein) that unite to form the hepatic portal vein [1], [2]. - While technically it creates the portal vein rather than draining into it, it is considered part of the portal vein system and receives direct tributaries before joining with the splenic vein [2]. - It collects blood from the small intestine, cecum, ascending colon, and part of the transverse colon.

Question 1

The stomach derives its blood supply from all these arteries directly or indirectly, except for which one?

Accepted Answer

Superior mesenteric artery

Answer

Splenic artery

Answer

Celiac axis

Answer

Hepatic artery

Question 2

Which artery dilatation causes compression of the 3rd part of the duodenum?

Accepted Answer

Superior mesenteric artery

Answer

Gastroduodenal artery

Answer

Inferior mesenteric artery

Answer

Celiac artery

Question 3

All of the following structures are related to the left ureter except which of the following?

Accepted Answer

Genitofemoral nerve

Answer

Testicular vessels

Answer

Sigmoid colon

Answer

Root of the mesentery

Question 4

In sepsis due to cholecystitis, which is the initial anatomical structure typically involved?

Accepted Answer

Quadrate lobe of liver

Answer

Left lobe of liver

Answer

Hepatic portal vein & IVC

Answer

Right lobe of liver

Question 5

What anatomical regions does the transpyloric plane separate?

Accepted Answer

Hypochondrium from lumbar region

Answer

Hypogastrium from hypochondrium

Answer

Iliac fossa from lumbar region

Answer

Umbilical region from lumbar region

Question 6

The anterolateral surface of the left kidney is related to which of the following vessels?

Accepted Answer

Splenic vessels

Answer

Left colic vessels

Answer

Both of the options

Answer

None of the options

Question 7

Right ovarian vein drains into which structure?

Accepted Answer

Inferior vena cava (IVC)

Answer

Right renal vein

Answer

Hemi azygos vein

Answer

Inferior mesenteric vein

Question 8

The tributaries of the inferior vena cava include all of the following, except:

Accepted Answer

Left gonadal vein

Answer

Left renal vein

Answer

Hepatic vein

Answer

Right suprarenal vein

Question 9

Which of the following structures is separated from the left kidney by a peritoneal layer?

Accepted Answer

Jejunum

Answer

Pancreas

Answer

Splenic flexure

Answer

Splenic vessels

Question 10

All are tributaries of the portal vein except which of the following?

Accepted Answer

Inferior pancreatoduodenal vein

Answer

Left gastric vein

Answer

Right gastric vein

Answer

Superior mesenteric vein

Abdomen — MCQs

Abdomen — MCQs

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