Abdomen — MCQs

Abdomen Indian Medical PG Practice Questions and MCQs

Question 741: Posterior duodenal ulcer is related to which artery?

A. Splenic artery
B. Superior mesenteric artery
C. Left gastric artery
D. Gastroduodenal artery (Correct Answer)

Explanation: ***Gastroduodenal artery*** - A **posterior duodenal ulcer** can erode into the gastroduodenal artery, leading to potentially life-threatening **upper gastrointestinal bleeding**. [1] - The gastroduodenal artery runs along the **posterior wall of the duodenum**, making it vulnerable to ulceration in this specific location. [1] *Splenic artery* - The splenic artery supplies the **spleen** and part of the stomach; it is not directly adjacent to the duodenum. - Erosion into the splenic artery would typically be associated with ulcers originating from the **posterior wall of the stomach**, not the duodenum. *Left gastric artery* - The left gastric artery supplies the **lesser curvature of the stomach** and distal esophagus. - While it can be a source of bleeding from **gastric ulcers**, it is anatomically distant from a posterior duodenal ulcer. *Superior mesenteric artery* - The superior mesenteric artery is a major vessel supplying the **midgut** (from the duodenum to the transverse colon). - It is located more **inferiorly and anteriorly** to the duodenum, and not directly at risk from a posterior duodenal ulcer.

Question 742: Nerve entering the inguinal canal through deep inguinal ring?

A. Ilioinguinal nerve
B. Pudendal nerve
C. Genital branch of genitofemoral (Correct Answer)
D. Superior rectal nerve

Explanation: ***Genital branch of genitofemoral*** - This nerve **traverses** the entire length of the inguinal canal, primarily residing within the **spermatic cord** in males or the **round ligament** in females [1]. - It arises from the **lumbar plexus** (L1-L2) and enters the canal through the deep inguinal ring [1]. *Ilioinguinal nerve* - The ilioinguinal nerve typically enters the inguinal canal more **superficial** to the deep inguinal ring, often piercing the **internal oblique muscle** [2]. - While it runs through a portion of the inguinal canal, it does not enter via the **deep inguinal ring** with the neurovascular structures destined for the testis/labia majora. *Pudendal nerve* - The pudendal nerve mainly supplies the **perineum** and **external genitalia** and does not enter the inguinal canal. - It courses through the **pudendal canal** (Alcock's canal) and is associated with the **sacral plexus**. *Superior rectal nerve* - The superior rectal nerve is a branch of the **inferior mesenteric plexus** and innervates the **superior part of the rectum**. - It is not associated with the **inguinal canal** or its contents.

Question 743: Superior rectal vein drains into?

A. Inferior mesenteric vein (Correct Answer)
B. External iliac vein
C. Internal iliac vein
D. Internal pudendal vein

Explanation: ### Inferior mesenteric vein - The **superior rectal vein** drains blood from the **upper part of the rectum**. - It then ascends to directly join the **inferior mesenteric vein**, which is part of the **portal venous system** [1]. *External iliac vein* - The **external iliac vein** primarily drains structures from the **lower limb** [2]. - It does not directly receive venous drainage from the rectum. *Internal iliac vein* - The **internal iliac vein** drains structures from the **pelvic viscera**, including the **middle and inferior rectal veins**. - However, the superior rectal vein specifically drains into the portal system via the inferior mesenteric vein. *Internal pudendal vein* - The **internal pudendal vein** drains structures of the **perineum** and external genitalia. - It is not involved in draining the main rectal venous flow.

Question 744: Bare area of liver is related to which of the following structures -

A. Hepatic veins (Correct Answer)
B. Hepatic portal vein
C. Cystic duct
D. Diaphragm

Explanation: ***Hepatic veins*** - The **bare area of the liver** is a region on the posterior-superior (diaphragmatic) surface of the liver that is **not covered by peritoneum** [2]. - This area is bounded by the **superior and inferior layers of the coronary ligament**. - Within this bare area, the **hepatic veins** drain into the **inferior vena cava (IVC)** as it ascends through a groove in the liver substance before entering the right atrium [1], [2]. - The **hepatic veins** are the key vascular structures directly related to the bare area, making this the expected answer in the context of clinically relevant structures [3]. *Diaphragm* - The bare area is indeed in **direct contact with the diaphragm**, which forms its posterior boundary [2]. - While anatomically the bare area is defined by this relationship with the diaphragm, in clinical and examination contexts, the question typically refers to the **vascular structures** within or traversing this area. - The diaphragm is more of a boundary structure rather than a structure "housed within" the bare area. *Hepatic portal vein* - The **hepatic portal vein** enters the liver at the **porta hepatis** on the inferior surface of the liver. - It brings **nutrient-rich, deoxygenated blood** from the gastrointestinal tract to the liver [1]. - The porta hepatis is anatomically separate from the bare area, which is on the posterior-superior surface. *Cystic duct* - The **cystic duct** connects the **gallbladder** to the **common hepatic duct** to form the common bile duct. - This is part of the **extrahepatic biliary tree** located in the **porta hepatis** region. - It is on the undersurface of the liver, completely separate from the bare area.

Question 745: Tumour of the uncinate process of the pancreas will compress which artery

A. Superior mesenteric artery (Correct Answer)
B. Inferior mesenteric artery
C. Common hepatic artery
D. Splenic artery

Explanation: ***Superior mesenteric artery*** - The **uncinate process** forms the lower and medial part of the head of the pancreas, hooking around and behind the **superior mesenteric vessels**. - A tumor in this region would therefore almost immediately compress the **superior mesenteric artery** and vein due to its close anatomical relationship. *Splenic artery* - The **splenic artery** runs along the superior border of the pancreas, primarily associated with the body and tail. - A tumor in the **uncinate process** (part of the head) would be anatomically distant from the splenic artery, making compression unlikely. *Inferior mesenteric artery* - The **inferior mesenteric artery** arises from the aorta much lower than the pancreas, typically at the L3 vertebral level. - Its anatomical position makes it spatially separated from the uncinate process of the pancreas, so compression is not expected. *Common hepatic artery* - The **common hepatic artery** runs anterior to the portal vein and to the left of the bile duct, supplying the liver. - It is located superior to the head of the pancreas and away from the uncinate process, hence not typically affected by tumors in that specific pancreatic region.

Question 746: Cholecystocaval line separates:

A. Segments IV and V of liver
B. Right and left lobes of liver
C. Right anterior and right posterior sectors of liver (Correct Answer)
D. Segments IV and VIII of liver

Explanation: ***Right anterior and right posterior sectors of liver*** - The **cholecystocaval line (or Cantlie's line)** is a surgical landmark that passes from the fossa of the gallbladder to the inferior vena cava [1]. - It divides the **right lobe** of the liver into the **right anterior sector** (containing segments V and VIII) and the **right posterior sector** (containing segments VI and VII) [1]. - The line roughly correlates with the course of the **middle hepatic vein**, which runs along this plane [1]. *Segments IV and V of liver* - Segment **IV** (quadrate lobe) is part of the **left functional lobe** (medial sector), while segment **V** is part of the **right anterior sector** [1]. - These segments are **not adjacent** and are separated by multiple anatomical planes, not specifically by the cholecystocaval line. *Segments IV and VIII of liver* - Segment **IV** is in the left functional lobe (medial sector), and segment **VIII** is in the **right anterior sector** [1]. - These segments are not directly separated by the cholecystocaval line, which divides the right lobe only. *Right and left lobes of liver* - While the cholecystocaval line does approximate the division between the **functional right and left lobes** of the liver (along the middle hepatic vein), this is not its primary definition [1]. - The **main portal fissure** is the principal divider of functional lobes. - The cholecystocaval line's **specific and primary role** is to divide the right lobe into its **anterior and posterior sectors** [1].

Question 747: Which of the following statements about the bare area of the liver is false?

A. It is circular in shape (Correct Answer)
B. It is not a site of portocaval anastomosis
C. Formed by the reflections of coronary ligaments
D. Infection can spread from the abdominal to thoracic cavity at this area

Explanation: ***It is circular in shape*** - The bare area of the liver is **triangular** in shape, bordered by the reflections of the **coronary ligaments** and the inferior vena cava. [1] - Its shape is dictated by the anatomical arrangement of these peritoneal folds, making it distinctly non-circular. *Infection can spread from the abdominal to thoracic cavity at this area* - This statement is true because the bare area is the only part of the liver not covered by **peritoneum**, allowing direct contact between the liver and the diaphragm. [1] - This anatomical arrangement facilitates the spread of infections, like **subphrenic abscesses**, from the abdominal cavity to the posterior mediastinum and pleural cavity. [2] *It is not a site of portocaval anastomosis* - This statement is true; there is **no direct portosystemic shunt** at the bare area of the liver that becomes significant in portal hypertension. - While small veins connect the liver capsule to the diaphragm, these do not represent major portocaval anastomoses like those found at the gastroesophageal junction or rectum. *Formed by the reflections of coronary ligaments* - This statement is true; the bare area is specifically demarcated by the points where the **anterior and posterior layers of the coronary ligament** diverge, leaving a triangular region of the liver directly apposed to the diaphragm. [1] - The **coronary ligaments** are reflections of the peritoneum from the diaphragm onto the superior surface of the liver.

Question 748: Floor of Petit triangle is formed by?

A. Internal oblique muscle (Correct Answer)
B. Sacrospinalis muscle
C. Rectus abdominis muscle
D. Fascia Transversalis layer

Explanation: ***Internal oblique muscle*** - The **Petit triangle** (lumbar triangle) is a landmark defined by the **latissimus dorsi posteriorly**, the **external oblique anteriorly**, and the **iliac crest inferiorly**. - Its **floor** is consistently formed by the **internal oblique muscle**, which lies deep to the external oblique [1]. *Sacrospinalis muscle* - The **sacrospinalis muscle** (erector spinae) is part of the deep back muscles, located medial to the Petit triangle. - It forms part of the **vertebral column's musculature** and is not directly associated with the floor of the Petit triangle. *Rectus abdominis muscle* - The **rectus abdominis muscle** is located medially in the anterior abdominal wall [1]. - It is distinct from the lateral abdominal wall muscles that form the boundaries and floor of the Petit triangle. *Fascia Transversalis layer* - The **fascia transversalis** is a deeper fascial layer lining the abdominal wall. - While it's deep to the internal oblique, the **muscle itself** forms the immediate anatomical floor of the Petit triangle.

Question 749: Haustrations are present in -

A. Duodenum
B. Ileum
C. Jejunum
D. Colon (Correct Answer)

Explanation: ***Colon*** - **Haustrations** are characteristic sacculations or pouches that give the colon its segmented appearance [1]. - They are formed by the tonic contractions of the **teniae coli**, which are three distinct bands of longitudinal smooth muscle found in the muscularis externa of the colon. *Duodenum* - The duodenum is the first part of the small intestine and is characterized by **plicae circulares (circular folds)** and **villi**, not haustrations. - Its primary role is chemical digestion and initial absorption, with a smooth, folded inner surface. *Ileum* - The ileum is the final and longest part of the small intestine, featuring **Peyer's patches** (lymphoid nodules) and prominent plicae circulares [2], but lacks haustrations. - Its main function is the absorption of vitamin B12 and bile salts [2]. *Jejunum* - The jejunum is the middle section of the small intestine, known for its tall and numerous **plicae circulares** and villi, making it highly efficient for nutrient absorption. - It does not possess haustrations, which are unique to the large intestine.

Question 750: Which of the following structures is not related to the third part of the duodenum?

A. Superior mesenteric vessels
B. Right ureter
C. Head of pancreas
D. Quadrate lobe of liver (Correct Answer)

Explanation: ***Quadrate lobe of liver*** - The **quadrate lobe of the liver** is located on the visceral surface of the liver, bounded by the gallbladder fossa, ligamentum teres, and porta hepatis. [1] - It is anatomically related to the **first part of the duodenum** and the pylorus, but has **no direct relationship** with the retroperitoneal **third part of the duodenum**, which lies at the L3 vertebral level. [2] - The third part of the duodenum is too inferior and posterior to have any relationship with the quadrate lobe. *Superior mesenteric vessels* - The **superior mesenteric artery** and **vein** cross **anteriorly** to the **third part of the duodenum** as it runs horizontally from right to left. - The duodenum passes between the aorta posteriorly and the superior mesenteric vessels anteriorly, creating a potential site for compression (**superior mesenteric artery syndrome**). *Right ureter* - The **right ureter** is a **posterior relation** of the **third part of the duodenum**, as both structures are retroperitoneal. [2] - The ureter descends on the psoas major muscle, passing behind the third part of the duodenum during its course toward the pelvis. *Head of pancreas* - The **head of pancreas**, specifically the **uncinate process**, lies **superior and posterior** to the **third part of the duodenum**. - The uncinate process hooks around posteriorly to the superior mesenteric vessels and has an intimate relationship with the third part of the duodenum.

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Anterior Abdominal Wall

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Peritoneum and Peritoneal Cavity

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Stomach and Intestines

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Liver, Gallbladder and Biliary Tract

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Pancreas and Spleen

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Kidneys and Suprarenal Glands

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Abdominal Vasculature

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Posterior Abdominal Wall

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Innervation of Abdominal Viscera

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Applied Anatomy and Clinical Correlations

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Abdomen — MCQs

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