Abdomen — MCQs
On this page
Following an emergency operation for hepatic and splenic trauma, the surgeon inserts a finger into the foramen of Winslow in an attempt to stop the bleeding. Which is TRUE of the hepatic artery?
All of the following are true about the ureter except:
All of the following structures cross the right ureter anteriorly, except?
A 52-year-old female presents at the outpatient clinic with pain in the groin. Physical examination reveals a bulge in the groin area immediately inferior to the inguinal canal. Which of the following structures is located immediately medial to a femoral hernia sac containing a loop of small intestine?
A 22-year-old man presented to his family physician with a laceration of the fibrous sheets or bands that cover his body under the skin and invest the muscles. Which of the following structures would most likely be injured?
A 3-year-old male presents with a palpable mass in the right side of his scrotum. A preliminary diagnosis of congenital, indirect inguinal hernia is made. What is the most likely cause of an indirect inguinal hernia in this patient?
How many vascular segments are present in the kidney?
A 43-year-old man complains of abdominal pain just above his umbilicus. On examination, a tumor is found anterior to the Inferior Vena Cava (IVC). Which of the following structures would most likely be compressed by this tumor?
Resistance to acyclovir is most commonly due to mutation in the viral gene that encodes a protein that:
What is the normal capacity of the renal pelvis?
Abdomen Indian Medical PG Practice Questions and MCQs
Question 241: Following an emergency operation for hepatic and splenic trauma, the surgeon inserts a finger into the foramen of Winslow in an attempt to stop the bleeding. Which is TRUE of the hepatic artery?
- A. It is called the common hepatic artery at this level.
- B. It is medial to the common bile duct and anterior to the portal vein. (Correct Answer)
- C. It is posterior to the portal vein.
- D. It is posterior to the inferior vena cava.
Explanation: ### Explanation The **Foramen of Winslow (Epiploic Foramen)** is the communication between the greater and lesser sacs. Its **anterior boundary** is the free edge of the **lesser omentum (hepatoduodenal ligament)**, which contains the portal triad [1]. Understanding the spatial arrangement of the portal triad is a high-yield concept for NEET-PG. **1. Why Option B is Correct:** Within the hepatoduodenal ligament, the structures are arranged as follows: * **Anteriorly:** The **Common Bile Duct (CBD)** lies on the **right**, and the **Hepatic Artery Proper** lies on the **left** (medial to the duct). * **Posteriorly:** The **Portal Vein** lies behind both the CBD and the hepatic artery [2]. Therefore, the hepatic artery is indeed medial to the CBD and anterior to the portal vein. **2. Why the Other Options are Incorrect:** * **Option A:** At this level, the vessel is the **Hepatic Artery Proper**. The *Common* Hepatic Artery becomes the Hepatic Artery Proper after giving off the gastroduodenal artery (usually behind the first part of the duodenum). * **Option C:** The Portal Vein is the most posterior structure of the triad; the artery lies anterior to it [2]. * **Option D:** The **Inferior Vena Cava (IVC)** forms the **posterior boundary** of the foramen of Winslow [1]. The hepatic artery is part of the anterior boundary, making it anterior to the IVC. ### Clinical Pearls for NEET-PG * **Pringle Maneuver:** This clinical technique involves compressing the hepatoduodenal ligament (and thus the portal triad) at the foramen of Winslow to control hemorrhage from the hepatic artery or portal vein during liver surgery. * **Boundaries of Foramen of Winslow:** * **Anterior:** Portal triad (Lesser omentum) [1]. * **Posterior:** IVC and Right crus of diaphragm [1]. * **Superior:** Caudate lobe of the liver. * **Inferior:** First part of the duodenum. * **Mnemonic for Triad:** **D**uct is **D**extra (Right), **A**rtery is **A**nister (Left/Sinister), and **V**ein is **V**ery behind.
Question 242: All of the following are true about the ureter except:
- A. Stasis at the hilum
- B. Changes its direction at the ischial spine
- C. Penetrates the bladder wall without a valve (Correct Answer)
- D. Enters the bladder at the lateral angle of the trigone
Explanation: The ureter is a muscular tube that conveys urine from the kidney to the bladder. Understanding its anatomical course and physiological mechanisms is crucial for NEET-PG. ### **Explanation of the Correct Option** **Option C is the correct answer (the false statement)** because the ureter does not possess a physical anatomical valve; instead, it utilizes a **physiological valve mechanism**. The ureter enters the bladder wall obliquely, creating an intramural tunnel (about 1.5–2 cm long). When the bladder fills and intravesical pressure rises, the bladder musculature compresses this intramural segment against the mucosa, effectively acting as a valve to prevent **vesicoureteral reflux (VUR)**. ### **Analysis of Other Options** * **Option A (Stasis at the hilum):** The ureteropelvic junction (at the hilum) is the first of the three physiological constrictions where urinary stasis can occur and calculi often lodge. * **Option B (Direction at Ischial Spine):** In the pelvis, the ureter runs downwards and backwards. At the level of the **ischial spine**, it turns medially and forwards to reach the base of the bladder [1]. * **Option C (Lateral angle of Trigone):** The ureters open into the bladder at the lateral angles of the vesical trigone via the ureteric orifices [1]. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Three Constrictions (Sites for Calculi):** * Ureteropelvic junction (UPJ). * Pelvic brim (where it crosses the common iliac artery). * Ureterovesical junction (UVJ) – **narrowest part**. 2. **Water Under the Bridge:** The ureter passes **posterior** to the uterine artery (females) and **posterior** to the vas deferens (males). 3. **Blood Supply:** It receives a segmental blood supply from the renal, gonadal, common iliac, and internal iliac (vesical) arteries [1]. 4. **Nerve Supply:** T10–L1 segments; pain from a stone is referred from the "loin to groin."
Question 243: All of the following structures cross the right ureter anteriorly, except?
- A. Terminal ileum
- B. Vas deferens
- C. Genitofemoral nerve (Correct Answer)
- D. Right colic and ileocolic vessels
Explanation: To answer this question correctly, one must distinguish between structures that cross the ureter **anteriorly** (superficial to it) versus those that lie **posteriorly** (deep to it). ### **Why Genitofemoral Nerve is the Correct Answer** The **genitofemoral nerve** (specifically its branches) lies **posterior** to the ureter. The ureter descends vertically on the retroperitoneum, resting directly upon the **psoas major muscle**. The genitofemoral nerve emerges from the substance of the psoas major and runs behind the ureter [1]. Therefore, it does not cross it anteriorly. ### **Analysis of Incorrect Options (Anterior Relations)** The right ureter is crossed anteriorly by several structures as it descends toward the pelvis: * **Terminal ileum (Option A):** As the ureter enters the pelvis, the terminal ileum and the root of the mesentery cross it anteriorly. * **Vas deferens (Option B):** In males, the vas deferens crosses the ureter anteriorly (superiorly) near the posterolateral angle of the bladder—a relationship often remembered by the phrase "water under the bridge" (ureter is the water, vas/uterine artery is the bridge). * **Right colic and ileocolic vessels (Option D):** These vessels travel within the retroperitoneum or mesentery to reach the colon, crossing the right ureter anteriorly. Additionally, the **gonadal vessels** (testicular/ovarian) also cross the ureter anteriorly [1]. ### **High-Yield NEET-PG Pearls** * **Posterior Relations:** Both ureters lie anterior to the **psoas major muscle**, the **genitofemoral nerve**, and the **common or external iliac arteries** (at the pelvic brim) [1]. * **"Water Under the Bridge":** In females, the **uterine artery** crosses anterior to the ureter. This is a critical surgical landmark during hysterectomy to avoid accidental ureteric ligation. * **Constrictions:** Remember the three sites of ureteric constriction where stones often lodge: (1) Ureteropelvic junction, (2) Pelvic brim/Iliac artery crossing, and (3) Vesicoureteric junction (narrowest part).
Question 244: A 52-year-old female presents at the outpatient clinic with pain in the groin. Physical examination reveals a bulge in the groin area immediately inferior to the inguinal canal. Which of the following structures is located immediately medial to a femoral hernia sac containing a loop of small intestine?
- A. Femoral artery
- B. Femoral nerve
- C. Femoral vein
- D. Lacunar ligament (Correct Answer)
Explanation: The clinical presentation of a bulge **inferior to the inguinal canal** (specifically below and lateral to the pubic tubercle) in an elderly female is classic for a **femoral hernia**. These hernias occur when abdominal contents protrude through the **femoral ring** into the femoral canal [1]. To identify the medial relation, one must understand the boundaries of the femoral ring: * **Anterior:** Inguinal ligament (Poupart’s ligament). * **Posterior:** Pectineal ligament (Cooper’s ligament) and the pectineus muscle. * **Lateral:** **Femoral vein** (separated by a thin septum). * **Medial:** **Lacunar ligament** (Gimbernat’s ligament). Since the hernia sac occupies the femoral canal, the **lacunar ligament** forms its immediate medial boundary. This rigid, sharp-edged ligament is often responsible for the high rate of incarceration and strangulation seen in femoral hernias [1]. **Analysis of Incorrect Options:** * **Femoral Vein (C):** This lies immediately **lateral** to the femoral canal/hernia sac. * **Femoral Artery (A):** This lies lateral to the femoral vein (further away from the hernia sac). * **Femoral Nerve (B):** This is the most lateral structure in the femoral triangle and lies **outside** the femoral sheath; it is not a direct boundary of the femoral canal. **High-Yield NEET-PG Pearls:** * **Mnemonic for Femoral Sheath (Lateral to Medial):** **N**erve (outside sheath), **A**rtery, **V**ein, **E**mpty space (Femoral canal), **L**acunar ligament (**NAVEL**). * Femoral hernias are more common in **females** due to a wider pelvis and larger femoral canal [1]. * The **Cloquet’s node** (deep inguinal lymph node) is the normal resident of the femoral canal. * Surgical management often requires releasing the **lacunar ligament** to reduce the hernia, but surgeons must be wary of an **abnormal obturator artery** (Corona Mortis) which may run behind the superior pubic ramus.
Question 245: A 22-year-old man presented to his family physician with a laceration of the fibrous sheets or bands that cover his body under the skin and invest the muscles. Which of the following structures would most likely be injured?
- A. Tendon
- B. Fascia (Correct Answer)
- C. Synovial tendon sheath
- D. Aponeurosis
Explanation: The correct answer is **Fascia**. **1. Why Fascia is correct:** The question describes "fibrous sheets or bands that cover the body under the skin and invest the muscles." This is the classic anatomical definition of **fascia**. Fascia is a connective tissue system divided into two types: * **Superficial fascia:** Located just beneath the skin (subcutaneous), containing fat, nerves, and vessels. * **Deep fascia:** A dense, organized connective tissue layer that invests muscles, forms intermuscular septa, and surrounds neurovascular bundles. **2. Why other options are incorrect:** * **Tendon (A):** A tendon is a tough, cord-like fibrous tissue that attaches a **muscle to a bone**. It does not act as a covering sheet for the body or invest muscles. * **Synovial tendon sheath (C):** These are double-layered tubular membranes containing synovial fluid that wrap around tendons (primarily in the hands and feet) to reduce friction. They do not cover the body or invest muscles generally. * **Aponeurosis (D):** While an aponeurosis is a "flattened, sheet-like tendon," its primary function is to attach muscle to muscle or muscle to bone (e.g., the Galea aponeurotica). It is a localized structure, not a generalized investing layer of the body. **Clinical Pearls for NEET-PG:** * **Compartment Syndrome:** The inelastic nature of deep fascia is clinically significant; if pressure increases within a fascial compartment (due to trauma or hemorrhage), it can lead to ischemia and nerve damage. * **Scarpa’s Fascia:** A high-yield layer of the superficial fascia of the lower abdomen that is continuous with **Colles’ fascia** in the perineum. * **Fascia Lata:** The deep fascia of the thigh, which is thickened laterally to form the **Iliotibial tract**.
Question 246: A 3-year-old male presents with a palpable mass in the right side of his scrotum. A preliminary diagnosis of congenital, indirect inguinal hernia is made. What is the most likely cause of an indirect inguinal hernia in this patient?
- A. The deep inguinal ring opens into an intact processus vaginalis. (Correct Answer)
- B. Congenital hydrocele
- C. Ectopic testis
- D. Epispadias
Explanation: ### Explanation **1. Why Option A is Correct:** The fundamental cause of a **congenital indirect inguinal hernia** is the **failure of the processus vaginalis to obliterate** after the descent of the testis [1]. The processus vaginalis is a peritoneal diverticulum that precedes the testis into the scrotum. If it remains patent (intact), the deep inguinal ring serves as an entry point, allowing abdominal viscera (like bowel loops) to protrude into the inguinal canal. In pediatric cases, this is almost always the underlying mechanism, as opposed to direct hernias which are caused by acquired weakness in the Hesselbach’s triangle. Indirect inguinal hernias occur more commonly on the right side due to a delay in the atrophy of the processus vaginalis following the slower descent of the right testis [1]. **2. Analysis of Incorrect Options:** * **B. Congenital Hydrocele:** While also caused by a patent processus vaginalis, a hydrocele involves the accumulation of **peritoneal fluid** rather than the protrusion of abdominal organs. If the opening is narrow, only fluid passes (hydrocele); if it is wide, viscera pass (hernia). * **C. Ectopic Testis:** This refers to a testis that has deviated from the normal path of descent (e.g., to the perineum or thigh). While it may coexist with inguinal pathologies, it is not the *cause* of a hernia. * **D. Epispadias:** This is a congenital malformation where the urethra opens on the **dorsal** surface of the penis. It is associated with bladder exstrophy, not inguinal hernias. **3. High-Yield Clinical Pearls for NEET-PG:** * **Path of Indirect Hernia:** Enters via the **Deep Inguinal Ring** (lateral to inferior epigastric artery), travels through the inguinal canal, and exits via the Superficial Inguinal Ring. * **Coverings:** Since it passes through the canal, it is covered by all three layers: Internal spermatic fascia (from fascia transversalis), Cremasteric fascia (from internal oblique), and External spermatic fascia (from external oblique aponeurosis). * **Rule of Thumb:** Indirect hernias are the **most common** type of hernia in both males and females, and the most common type in children [1]. * **Clinical Sign:** A positive **Internal Ring Occlusion Test** (hernia does not descend when the deep ring is occluded) confirms an indirect hernia.
Question 247: How many vascular segments are present in the kidney?
- A. 5 (Correct Answer)
- B. 7
- C. 9
- D. 11
Explanation: **Explanation:** The human kidney is divided into **five vascular segments**, each supplied by a specific **segmental artery**. These arteries are "end arteries," meaning there is no significant collateral circulation between segments. This anatomical arrangement is crucial for surgical procedures like partial nephrectomy. The five segments are: 1. **Apical (Superior):** Supplies the upper pole. 2. **Upper (Anterior-Superior):** Supplies the upper part of the anterior surface. 3. **Middle (Anterior-Inferior):** Supplies the lower part of the anterior surface. 4. **Lower (Inferior):** Supplies the entire lower pole. 5. **Posterior:** Supplies the posterior surface between the apical and lower segments. **Analysis of Options:** * **Option A (5):** Correct. The renal artery typically divides into an anterior division (giving 4 segmental arteries) and a posterior division (giving 1 segmental artery), totaling five. * **Options B, C, and D (7, 9, 11):** These are incorrect as they do not correspond to the standard anatomical division of renal vasculature. While the liver has 8 segments (Couinaud classification) and lungs have 10 bronchopulmonary segments per side, the kidney consistently follows the five-segment pattern. **Clinical Pearls for NEET-PG:** * **Brodel’s Line:** An avascular plane located on the lateral border of the kidney, between the areas supplied by the anterior and posterior divisions. It is the preferred site for **nephrolithotomy** to minimize bleeding. * **Segmental vs. Lobar:** Segmental arteries further divide into lobar, interlobar, arcuate, and finally interlobular arteries. * **End Arteries:** Because segmental arteries do not anastomose, the occlusion of one leads to infarction of that specific segment.
Question 248: A 43-year-old man complains of abdominal pain just above his umbilicus. On examination, a tumor is found anterior to the Inferior Vena Cava (IVC). Which of the following structures would most likely be compressed by this tumor?
- A. Right sympathetic trunk
- B. Left third lumbar artery
- C. Third part of the duodenum (Correct Answer)
- D. Left renal artery
Explanation: **Explanation:** The correct answer is **C. Third part of the duodenum.** The **third (horizontal) part of the duodenum** runs transversely from right to left across the vertebral column at the level of the **L3 vertebra**. Anatomically, it is "sandwiched" between two major vascular structures: it lies **anterior to the Inferior Vena Cava (IVC)** and the abdominal aorta, and **posterior to the Superior Mesenteric Artery (SMA)** and vein. Therefore, a tumor located immediately anterior to the IVC at the supra-umbilical level is most likely to compress this segment of the duodenum. **Analysis of Incorrect Options:** * **A. Right sympathetic trunk:** This structure lies **posterior** to the IVC, resting on the psoas major muscle and the vertebral bodies. * **B. Left third lumbar artery:** Lumbar arteries arise from the posterior aspect of the aorta. The left-sided lumbar arteries are located far to the left of the IVC. * **C. Left renal artery:** This artery arises at the **L1-L2 level** (higher than the umbilicus) and passes **posterior** to the IVC to reach the left kidney. **NEET-PG High-Yield Pearls:** * **SMA Syndrome (Wilkie’s Syndrome):** Compression of the 3rd part of the duodenum between the SMA and the Aorta/IVC due to a loss of the mesenteric fat pad. * **Relations of the IVC:** The IVC is crossed anteriorly by the 1st and 3rd parts of the duodenum, the head of the pancreas, and the portal vein. * **Vertebral Levels:** Remember the "Rule of 1-2-3": The 1st part of the duodenum is at L1, the 2nd at L1-L3, and the **3rd part at L3**.
Question 249: Resistance to acyclovir is most commonly due to mutation in the viral gene that encodes a protein that:
- A. Converts viral RNA into DNA
- B. Phosphorylates acyclovir (Correct Answer)
- C. Transports acyclovir into the cell
- D. Transports acyclovir out of the cell
Explanation: ### Explanation **Correct Option: B. Phosphorylates acyclovir** Acyclovir is a **nucleoside analog** that acts as a prodrug. To become active, it must undergo three phosphorylation steps. The first and most critical step is the conversion of acyclovir to acyclovir monophosphate, which is mediated by the viral enzyme **Thymidine Kinase (TK)**. Host cell enzymes then complete the conversion to acyclovir triphosphate, which inhibits viral DNA polymerase. The most common mechanism of resistance in Herpes Simplex Virus (HSV) and Varicella-Zoster Virus (VZV) is a **mutation in the viral gene encoding Thymidine Kinase**, resulting in a "TK-deficient" or "TK-altered" strain. Without this initial phosphorylation, the drug cannot be activated. **Analysis of Incorrect Options:** * **A. Converts viral RNA into DNA:** This describes Reverse Transcriptase (found in HIV). Acyclovir targets DNA viruses (HSV/VZV) and does not involve reverse transcription. * **C & D. Transport mechanisms:** Resistance to acyclovir is biochemical (enzymatic), not related to cellular influx or efflux pumps. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism of Action:** Acyclovir triphosphate acts as a **chain terminator** because it lacks a 3' hydroxyl group, preventing further DNA elongation. * **Selectivity:** Acyclovir is highly selective because its initial phosphorylation occurs 100-1000 times faster in virus-infected cells than in uninfected cells. * **Cross-Resistance:** TK-deficient strains are also resistant to Valacyclovir and Famciclovir. * **Alternative for Resistance:** In cases of acyclovir resistance (common in immunocompromised patients), **Foscarnet** or **Cidofovir** are used because they do not require phosphorylation by viral Thymidine Kinase to be active.
Question 250: What is the normal capacity of the renal pelvis?
- A. 7 ml (Correct Answer)
- B. 10 ml
- C. 15 ml
- D. 20 ml
Explanation: The renal pelvis is the funnel-shaped, proximal dilated part of the ureter located within the renal sinus. Understanding its capacity is crucial for interpreting diagnostic imaging and understanding obstructive uropathy. **1. Why 7 ml is correct:** The average capacity of the adult renal pelvis is approximately **5 to 8 ml** (with **7 ml** being the standard textbook value cited in anatomical references like Gray’s Anatomy). This small volume reflects its role as a conduit rather than a storage organ. When the volume exceeds this limit due to obstruction (e.g., a stone or PUJ obstruction), the intrapelvic pressure rises, leading to hydronephrosis. **2. Analysis of Incorrect Options:** * **10 ml (Option B):** While some physiological variations exist, 10 ml is generally considered the upper limit of normal. Values consistently at or above this level often indicate early pelvicalyceal dilatation. * **15 ml & 20 ml (Options C & D):** These volumes are significantly higher than the physiological norm. A renal pelvis holding 15–20 ml of fluid is pathologically dilated, characteristic of moderate hydronephrosis. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Pelvi-Ureteric Junction (PUJ):** This is the narrowest part of the upper urinary tract and a common site for congenital obstruction. Although various thresholds have been defined, the fetal pelvis is typically considered dilated if it exceeds 7 mm in the third trimester [1]. * **Intravenous Pyelogram (IVP):** If the renal pelvis appears distended beyond its 7 ml capacity on IVP, it is a primary radiological sign of obstruction. * **Relations:** The renal pelvis is formed by the joining of 2–3 major calyces, which in turn are formed by 7–13 minor calyces. * **Epithelium:** Like the rest of the urinary tract (except the terminal urethra), it is lined by **transitional epithelium (urothelium)**.
Practice by Chapter
Anterior Abdominal Wall
Practice Questions
Peritoneum and Peritoneal Cavity
Practice Questions
Stomach and Intestines
Practice Questions
Liver, Gallbladder and Biliary Tract
Practice Questions
Pancreas and Spleen
Practice Questions
Kidneys and Suprarenal Glands
Practice Questions
Abdominal Vasculature
Practice Questions
Posterior Abdominal Wall
Practice Questions
Innervation of Abdominal Viscera
Practice Questions
Applied Anatomy and Clinical Correlations
Practice Questions
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free