Abdomen Practice Questions

Q: A surgeon removes a part of the liver to the left of the falciform ligament. Which segment of the liver is removed?

Segments 2 and 3. ### Explanation The liver is divided into functional units based on the **Couinaud Classification**, which uses the distribution of the portal vein, hepatic artery, and bile ducts [1]. **1. Why Segments 2 and 3 are correct:** Anatomically, the **falciform ligament** and the **left sagittal fissure** (containing the ligamentum teres and ligamentum venosum) divide the liver into anatomical left and right lobes [1]. To the left of the falciform ligament lies the **Left Lateral Sector**. According to Couinaud’s segments: * **Segment 2:** Left Superior Lateral Segment * **Segment 3:** Left Inferior Lateral Segment [2] These two segments constitute the anatomical left lobe that is visible to the left of the falciform ligament. **2. Why other options are incorrect:** * **Segment 4:** This is the **Left Medial Segment** (Quadrate lobe). While functionally part of the left liver, it lies to the **right** of the falciform ligament/umbilical fissure, between the falciform ligament and the gallbladder fossa [1]. * **Segment 1:** This is the **Caudate lobe**. It is situated posteriorly and receives blood supply from both right and left vascular bundles, making it functionally independent [3]. It does not lie to the left of the falciform ligament. **3. High-Yield Clinical Pearls for NEET-PG:** * **Cantlie’s Line:** The functional division of the liver (separating true left and right lobes) runs from the **IVC to the gallbladder fossa**, not the falciform ligament. * **Segment 4** is unique because it belongs to the anatomical right lobe (right of falciform) but the functional left lobe (left of Cantlie's line). * **Pringle Maneuver:** Clamping the hepatoduodenal ligament (portal vein, hepatic artery, common bile duct) to control bleeding during liver surgery. * **The Hepatic Veins** (Right, Middle, Left) act as the boundaries between the sectors of the liver.

Q: What is the predominant source of blood supply to the organ shown in the histological slide?

Portal vein. ***Portal vein*** - Supplies **75-80%** of the liver's blood supply, carrying **nutrient-rich deoxygenated blood** from the gastrointestinal tract and spleen. - Forms the **portal triad** along with hepatic artery and bile duct, visible in liver lobule histology as part of the **portal area**. *Hepatic artery* - Provides only **20-25%** of liver blood supply, carrying **oxygenated blood** from the systemic circulation. - While essential for **oxygen delivery** to hepatocytes, it is not the predominant source of blood supply. *Hepatic vein* - Functions as **drainage** rather than supply, carrying deoxygenated blood away from the liver to the **inferior vena cava**. - Located at the **center of liver lobules** (central vein) and represents outflow, not inflow of blood. *Cystic artery* - Supplies blood specifically to the **gallbladder**, not the liver parenchyma. - A branch of the **right hepatic artery**, it has no role in hepatic blood supply and would not be visible in liver histology.

Q: The third part of the duodenum is crossed by which of the following structures?

Superior mesenteric artery. The third (horizontal) part of the duodenum is approximately 10 cm long and runs horizontally to the left across the third lumbar vertebra. ### **Why the Correct Answer is Right** The **Superior Mesenteric Artery (SMA)** and the Superior Mesenteric Vein emerge from behind the pancreas and descend **anteriorly** to the third part of the duodenum. This anatomical relationship is critical because the duodenum is "sandwiched" between the SMA in front and the Abdominal Aorta behind. ### **Analysis of Incorrect Options** * **A, B, and C (Portal vein, Hepatic artery, Bile duct):** These structures are primarily related to the **first part** of the duodenum. They travel within the hepatoduodenal ligament (lesser omentum) superior to the duodenum or pass posterior to its first part to reach the liver or head of the pancreas. ### **Clinical Pearls for NEET-PG** * **SMA Syndrome (Wilkie’s Syndrome):** This occurs when the angle between the SMA and the Aorta narrows (e.g., due to rapid weight loss and loss of the mesenteric fat pad), compressing the third part of the duodenum and causing intestinal obstruction. * **Posterior Relations:** The third part of the duodenum lies anterior to the **Abdominal Aorta**, **Inferior Vena Cava (IVC)**, and the **Right Psoas Major** muscle. * **Root of the Mesentery:** The third part is also crossed anteriorly by the root of the mesentery of the small intestine.

Q: The rectus sheath contains all of the following except?

Genitofemoral nerve. The **rectus sheath** is an aponeurotic envelope formed by the tendons of the three flat abdominal muscles, housing the rectus abdominis and several neurovascular structures [1]. ### **Explanation of the Correct Answer** **B. Genitofemoral nerve:** This nerve (L1, L2) originates from the lumbar plexus. It pierces the psoas major muscle and descends on its anterior surface, eventually dividing into genital and femoral branches. It is located in the **retroperitoneal space** and the inguinal canal, but it **never enters the rectus sheath**. The nerves found within the rectus sheath are the terminal branches of the lower six thoracic nerves (T7–T12) [2]. ### **Analysis of Incorrect Options** * **A. Pyramidalis muscle:** This is a small, triangular muscle located in the lower part of the rectus sheath, anterior to the rectus abdominis [1]. It is present in about 80% of the population. * **C & D. Superior and Inferior epigastric vessels:** These are the primary vascular contents of the sheath [2]. The superior epigastric (from internal thoracic) and inferior epigastric (from external iliac) arteries anastomose within the sheath, providing blood supply to the rectus muscle and the overlying skin [2]. ### **High-Yield Clinical Pearls for NEET-PG** * **Contents of Rectus Sheath:** 1. **Muscles:** Rectus abdominis and Pyramidalis [1]. 2. **Arteries/Veins:** Superior and Inferior epigastric vessels [2]. 3. **Nerves:** Terminal parts of the lower five intercostal nerves and the subcostal nerve (T7–T12) [2]. * **The Arcuate Line (of Douglas):** Below this line (midway between the umbilicus and pubic symphysis), the posterior wall of the rectus sheath is absent because all three aponeuroses pass anterior to the rectus abdominis [1]. * **Clinical Significance:** The inferior epigastric artery is a key landmark during laparoscopic hernia repair; it forms the lateral boundary of **Hesselbach’s triangle** [1].

Q: Which of the following statements about the common bile duct is FALSE?

Is anterior to the first part of the duodenum.. The **Common Bile Duct (CBD)** is a critical anatomical structure frequently tested in NEET-PG regarding its relations to the duodenum and the portal triad. ### **Why Option B is False** The CBD is divided into four parts: supraduodenal, retroduodenal, infraduodenal, and intraduodenal. The second part of the CBD passes **posterior** (behind) to the first part of the duodenum, not anterior. This is a high-yield distinction; the gastroduodenal artery also runs posterior to the first part of the duodenum, making both structures vulnerable during posterior duodenal ulcer perforations. ### **Analysis of Other Options** * **Option A (True):** The supraduodenal part of the CBD lies in the **right free margin of the lesser omentum** (the hepatoduodenal ligament), forming the anterior boundary of the Epiploic Foramen of Winslow. * **Option C (True):** Within the portal triad, the CBD is situated to the **right**, while the Hepatic Artery lies to the **left** [3]. * **Option D (True):** In the portal triad, both the CBD and the Hepatic Artery are positioned **anterior** to the Portal Vein, which lies in the most posterior plane [3]. ### **NEET-PG High-Yield Pearls** * **Mnemonic for Portal Triad (Right to Left):** **D**uct, **A**rtery, **V**ein (**D-A-V**). Duct is most right, Vein is most posterior. * **Length:** The CBD is approximately 8 cm long with a diameter of about 6 mm. * **Formation:** It is formed by the union of the Common Hepatic Duct and the Cystic Duct [2]. * **Clinical Correlation:** A gallstone lodged in the distal CBD can cause obstructive jaundice and acute pancreatitis if it blocks the Ampulla of Vater [1].

Q: A 74-year-old man with newly diagnosed hepatocellular carcinoma has a CT scan reviewed by an oncologist. The affected quadrate lobe of the liver is located. Which of the following is true regarding the quadrate lobe?

It drains bile into the left hepatic duct.. The **quadrate lobe** of the liver is functionally part of the **left lobe**, despite being anatomically located on the visceral surface of the right lobe. [2] ### 1. Why Option C is Correct According to the **Couinaud classification**, the liver is divided into functional segments based on vascular supply and biliary drainage. [3] The quadrate lobe corresponds to **Segment IV**. [2] Functionally, it receives its blood supply from the left hepatic artery and, crucially, its **biliary drainage is into the left hepatic duct**. In the NEET-PG context, always remember that functional anatomy (physiology/surgery) overrides gross morphology. ### 2. Analysis of Incorrect Options * **Option A:** This describes the **Caudate lobe** (Segment I). [1] The quadrate lobe is located between the **gallbladder fossa** (right) and the **fissure for the ligamentum teres** (left). * **Option B:** Since it is functionally part of the left lobe, it receives blood from the **left hepatic artery**, not the right. [2] * **Option D:** The quadrate lobe is the **medial inferior segment** (Segment IVb). The medial superior segment is Segment IVa. ### 3. Clinical Pearls for NEET-PG * **Caudate vs. Quadrate:** The Caudate lobe is "C" (Cephalad/Superior) and related to the IVC. The Quadrate lobe is "Q" (Lower/Inferior) and related to the Gallbladder. * **Segment I (Caudate Lobe):** Unique because it receives blood from both right and left hepatic arteries and drains bile into both ducts. [1] It also drains venous blood directly into the IVC, bypassing the hepatic veins. * **Cantlie’s Line:** An imaginary line from the IVC to the gallbladder fossa that divides the liver into functional right and left halves. [2] The quadrate lobe lies to the left of this line. [4]

Q: A patient was admitted with a bleeding ulcer of the lesser curvature of the stomach. Which artery is MOST likely to be involved?

Left gastric. ### Explanation The stomach is supplied by a rich anastomotic network of arteries derived from the **celiac trunk**. To answer this question, one must correlate the surface anatomy of the stomach with its specific vascular supply. **Why Left Gastric Artery is Correct:** The **lesser curvature** of the stomach is primarily supplied by the **Left Gastric Artery** (a direct branch of the celiac trunk) and the **Right Gastric Artery** (a branch of the common hepatic artery). Among these, the left gastric artery is the largest and most significant vessel along the lesser curvature. Ulcers located here, particularly those on the posterior wall, frequently erode into this artery, leading to hematemesis or melena [1]. **Analysis of Incorrect Options:** * **Gastroduodenal Artery:** This artery runs posterior to the **first part of the duodenum**. It is the most common source of life-threatening hemorrhage in **posterior duodenal ulcers**, not gastric ulcers. * **Left Gastro-omental (Gastroepiploic) Artery:** A branch of the splenic artery, it supplies the upper part of the **greater curvature**. * **Right Gastro-omental (Gastroepiploic) Artery:** A branch of the gastroduodenal artery, it supplies the lower part of the **greater curvature**. **NEET-PG High-Yield Pearls:** * **Most common site for Gastric Ulcer:** Lesser curvature (specifically the *incisura angularis*). * **Most common site for Duodenal Ulcer:** First part of the duodenum (Anterior wall = perforation; Posterior wall = hemorrhage). * **Vessel involved in Posterior Duodenal Ulcer:** Gastroduodenal artery. * **Vessel involved in Lesser Curvature Ulcer:** Left gastric artery [1]. * **Vessel involved in Greater Curvature Ulcer:** Gastro-omental arteries.

Q: Which of the following forms the anterior wall of the inguinal canal?

Internal oblique muscle. The inguinal canal is an oblique passage in the lower abdominal wall. Understanding its boundaries is a high-yield topic for NEET-PG [1]. ### **Explanation of the Correct Answer** The **anterior wall** of the inguinal canal is formed by: 1. **External oblique aponeurosis** along its entire length [1]. 2. **Internal oblique muscle** in its lateral one-third [1]. Since "External oblique muscle" (Option C) refers to the muscle belly rather than the aponeurosis, and the **Internal oblique muscle** specifically reinforces the lateral portion of the anterior wall, it is the most accurate anatomical choice among the options provided. ### **Analysis of Incorrect Options** * **B. Transverse abdominis muscle:** This muscle does not contribute to the anterior wall. Instead, its lower fibers arch over the canal to form the **roof** [3]. * **C. External oblique muscle:** While the *aponeurosis* of this muscle forms the entire anterior wall, the *muscle fibers* themselves end higher up and do not form the wall of the canal [2]. * **D. Conjoint tendon:** Formed by the fusion of the internal oblique and transversus abdominis aponeuroses, it forms the **posterior wall** (medial half), reinforcing the area behind the superficial inguinal ring. ### **Clinical Pearls for NEET-PG** * **Mnemonic for Boundaries (MALT):** * **M**- Superior (Roof): **M**uscles (Internal oblique and Transversus abdominis). * **A**- Anterior: **A**poneurosis (External oblique) + Internal oblique (lateral 1/3). * **L**- Inferior (Floor): **L**igaments (Inguinal and Lacunar). * **T**- Posterior: **T**endon (Conjoint tendon) + Fascia transversalis. * **Deep Inguinal Ring:** An opening in the **fascia transversalis** [3]. * **Superficial Inguinal Ring:** A triangular opening in the **external oblique aponeurosis**. * **Hesselbach’s Triangle:** The site for direct inguinal hernias; its lateral border is the inferior epigastric artery.

Question 1

A surgeon removes a part of the liver to the left of the falciform ligament. Which segment of the liver is removed?

Accepted Answer

Segments 2 and 3

Answer

Segments 2 and 4

Answer

Segments 1 and 4

Answer

Segments 1 and 3

Question 2

What is the predominant source of blood supply to the organ shown in the histological slide?

Accepted Answer

Portal vein

Answer

Hepatic artery

Answer

Hepatic vein

Answer

Cystic artery

Question 3

Which of the following is NOT a function of the peritoneum?

Accepted Answer

Hormone release

Answer

Lubrication

Answer

Pain sensitivity

Answer

Enzymatic digestion

Question 4

The third part of the duodenum is crossed by which of the following structures?

Accepted Answer

Superior mesenteric artery

Answer

Portal vein

Answer

Hepatic artery

Answer

Bile duct

Question 5

The rectus sheath contains all of the following except?

Accepted Answer

Genitofemoral nerve

Answer

Pyramidalis muscle

Answer

Inferior epigastric vessels

Answer

Superior epigastric vessels

Question 6

Which of the following statements about the common bile duct is FALSE?

Accepted Answer

Is anterior to the first part of the duodenum.

Answer

Lies in the free margin of the lesser omentum.

Answer

Is to the right of the hepatic artery.

Answer

Is anterior to the portal vein.

Question 7

Which of the following structures is related to the lateral border of the right kidney?

Accepted Answer

Right lobe of the liver and the hepatic flexure of the colon

Answer

Right lobe of the liver and the descending colon

Answer

The spleen and the descending colon

Answer

The spleen and the hepatic flexure of the colon

Question 8

A 74-year-old man with newly diagnosed hepatocellular carcinoma has a CT scan reviewed by an oncologist. The affected quadrate lobe of the liver is located. Which of the following is true regarding the quadrate lobe?

Accepted Answer

It drains bile into the left hepatic duct.

Answer

It lies between the inferior vena cava and the ligamentum venosum.

Answer

It receives blood from the right hepatic artery.

Answer

It is a medial superior segment.

Question 9

A patient was admitted with a bleeding ulcer of the lesser curvature of the stomach. Which artery is MOST likely to be involved?

Accepted Answer

Left gastric

Answer

Gastroduodenal

Answer

Left gastro-omental

Answer

Right gastro-omental

Question 10

Which of the following forms the anterior wall of the inguinal canal?

Accepted Answer

Internal oblique muscle

Answer

Transverse abdominis muscle

Answer

External oblique muscle

Answer

Conjoint tendon

Abdomen — MCQs

Abdomen — MCQs

On this page

Practice by Chapter

Want unlimited practice?