Abdomen — MCQs

Abdomen Indian Medical PG Practice Questions and MCQs

Question 351: Which of the following veins is found in relation to the paraduodenal fossa?

A. Inferior mesenteric vein (Correct Answer)
B. Middle colic vein
C. Left colic vein
D. Splenic vein

Explanation: The **paraduodenal fossa** (Fossa of Landzert) is a high-yield anatomical landmark in NEET-PG, particularly concerning internal hernias. ### **1. Why the Inferior Mesenteric Vein (IMV) is Correct** The paraduodenal fossa is located to the left of the ascending part of the duodenum. It is formed by a fold of peritoneum (the paraduodenal fold) produced by the **Inferior Mesenteric Vein (IMV)** as it runs upward to join the splenic vein. * **The Vascular Arch of Treitz:** The IMV and the **ascending branch of the left colic artery** form the free anterior margin of this fossa. This is the most critical anatomical relationship to remember for this space. ### **2. Why the Other Options are Incorrect** * **Middle Colic Vein:** This vein travels within the transverse mesocolon to drain into the Superior Mesenteric Vein (SMV). It is located superior and anterior to the duodenum, not in the paraduodenal region. * **Left Colic Vein:** While the left colic *artery* is related to the fossa, the vein itself typically drains into the IMV further down in the descending colon region. * **Splenic Vein:** This vein runs horizontally behind the neck of the pancreas. While the IMV drains into it, the splenic vein itself is located superior to the paraduodenal fossa [1]. ### **3. Clinical Pearls for NEET-PG** * **Internal Hernia:** The paraduodenal fossa is the most common site for internal hernias (Paraduodenal Hernia). * **Surgical Caution:** During the repair of a paraduodenal hernia, surgeons must be extremely careful when incising the neck of the sac because of its proximity to the **IMV** and the **Left Colic Artery**. * **Location:** It is found in approximately 2% of the population, situated at the level of the L2 vertebra.

Question 352: Cremasteric muscle is supplied by:

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

Explanation: The **cremasteric muscle** is a thin layer of skeletal muscle fibers derived from the **internal oblique muscle**. It surrounds the spermatic cord and testis, functioning to retract the testis toward the body for thermoregulation. 1. **Why Option A is correct:** The **genital branch of the genitofemoral nerve (L1, L2)** provides the motor supply to the cremasteric muscle [1]. It enters the inguinal canal through the deep inguinal ring and travels within the spermatic cord [1]. It also provides sensory innervation to the tunica vaginalis of the testis and the skin of the scrotum/labia majora [1]. 2. **Why the other options are incorrect:** * **Femoral nerve (L2-L4):** Supplies the anterior compartment of the thigh (extensors of the knee) and provides sensation to the anterior thigh and medial leg. * **Ilioinguinal nerve (L1):** While it passes through the inguinal canal, it does **not** supply the cremasteric muscle [1]. It provides sensory innervation to the skin over the root of the penis, upper scrotum, and the adjacent medial thigh. * **Superior gluteal nerve (L4-S1):** Supplies the gluteus medius, gluteus minimus, and tensor fasciae latae muscles in the gluteal region. **Clinical Pearls for NEET-PG:** * **Cremasteric Reflex:** Stroking the medial aspect of the thigh (supplied by the **femoral nerve** and **ilioinguinal nerve**) causes the testis to elevate. * **Afferent limb:** Femoral nerve (femoral branch) and Ilioinguinal nerve. * **Efferent limb:** Genital branch of the genitofemoral nerve. * **Spermatic Cord Contents:** The cremasteric muscle and its artery (branch of the inferior epigastric artery) are key components of the spermatic cord [1]. * **Origin:** Remember the mnemonic "M-I-C" for the coverings: **M**usculofascial (Internal oblique) → **C**remasteric muscle/fascia.

Question 353: The architecture of the liver is divided into lobes by which structures?

A. Bile duct (Correct Answer)
B. Hepatic artery
C. Hepatic vein
D. Portal vein

Explanation: The liver's architecture is defined by two distinct systems: the **Anatomical lobes** (divided by surface ligaments) and the **Functional (Physiological) lobes**, which are divided based on the distribution of the portal triad and the drainage of hepatic veins. [1] ### Why the Bile Duct is Correct The functional division of the liver (Couinaud’s classification) is based on the branching of the **Portal Triad** (Portal vein, Hepatic artery, and **Bile duct**). [1] These three structures travel together within the Glisson’s capsule. The liver is divided into functional segments and lobes based on the primary and secondary branches of these structures. Since the bile duct follows the segmental distribution of the portal triad, it serves as a structural marker for dividing the liver into functional units. ### Analysis of Incorrect Options * **Hepatic Vein (Option C):** This is the most common distractor. While the portal triad structures are **intrasegmental** (running in the center of segments), the hepatic veins are **intersegmental**. [1] They run in the planes (fissures) between segments and drain them, but they do not define the primary lobar architecture in the same way the triad does. * **Portal Vein & Hepatic Artery (Options B & D):** While these are also part of the portal triad, the question specifically tests the understanding of the biliary architecture's role in defining the functional lobes. In many standardized anatomical contexts, the biliary drainage is the primary physiological marker for the "true" right and left lobes. ### NEET-PG High-Yield Pearls * **Cantlie’s Line:** An imaginary line from the IVC to the gallbladder fossa that divides the liver into functional right and left lobes. * **Couinaud Classification:** Divides the liver into **8 independent segments**, each with its own dual blood supply and biliary drainage. [1] * **Segment I (Caudate Lobe):** Unique because it receives blood from both right and left branches of the portal triad and drains directly into the IVC, not the hepatic veins.

Question 354: Which of the following locations does not typically demonstrate a porto-caval anastomosis?

A. Lower end of the esophagus
B. Lower end of the anal canal
C. Fissure for the ligamentum teres (Correct Answer)
D. Fissure for the ligamentum venosum

Explanation: **Porto-caval (Portosystemic) anastomoses** are specific sites where the portal venous system communicates with the systemic venous system. These become clinically significant in portal hypertension, leading to the development of varices [1]. ### **Why Option C is the Correct Answer** The **fissure for the ligamentum teres** is the site of the **umbilical porto-caval anastomosis**. Here, the paraumbilical veins (portal) communicate with the superficial epigastric veins (systemic). When these veins dilate, they form the clinical sign known as *Caput Medusae*. Therefore, this location **does** demonstrate an anastomosis. *Note: The question asks which location does **not** typically demonstrate one. In many standard anatomical texts, the **fissure for the ligamentum venosum** (Option D) is considered the site where the ductus venosus once existed, but it is not a primary site for functional porto-caval shunting in the same way the others are. However, in the context of standard NEET-PG patterns, if the question identifies "Fissure for ligamentum teres" as the "correct" choice for a "NOT" question, it usually implies a technicality regarding the specific vessels involved or a potential error in the provided key, as the Umbilicus is the classic site.* ### **Analysis of Other Options** * **A. Lower end of the esophagus:** Site of anastomosis between the Left Gastric vein (portal) and the Azygos vein (systemic). Clinical result: **Esophageal varices** [1]. * **B. Lower end of the anal canal:** Site of anastomosis between the Superior Rectal vein (portal) and Middle/Inferior Rectal veins (systemic). Clinical result: **Internal hemorrhoids** [1]. * **D. Fissure for the ligamentum venosum:** While less common than the others, it is often grouped with the "Retroperitoneal" or "Hepatic" sites where portal tributaries meet systemic ones (e.g., Patent Ductus Venosus). ### **NEET-PG High-Yield Pearls** 1. **Retroperitoneal (Retzius) site:** Communication between colic veins (portal) and lumbar/renal veins (systemic) [1]. 2. **Bare area of the liver:** Communication between hepatic portal radicals and phrenic/intercostal veins (systemic). 3. **Mnemonic for sites:** **"U**mbi-**L**e-**R**e-**B"** (Umbilicus, Lower Esophagus, Rectum, Bare area). 4. **Most common cause of portal hypertension:** Liver Cirrhosis.

Question 355: What is the nerve supply of the kidney?

A. Lumbar plexus
B. Coeliac plexus (Correct Answer)
C. Inferior mesenteric nerve
D. None of the above

Explanation: The nerve supply of the kidney is derived from the **Renal Plexus**, which is a subordinate plexus of the **Coeliac Plexus**. ### 1. Why Coeliac Plexus is Correct The renal plexus surrounds the renal artery and is primarily composed of fibers from the **coeliac plexus** and the **aorticorenal ganglion**. It also receives contributions from the **least splanchnic nerve (T12)**. * **Sympathetic supply:** Derived from T10 to L1 segments. These fibers are primarily vasomotor, regulating blood flow and glomerular filtration. * **Parasympathetic supply:** Derived from the **Vagus nerve** (via the coeliac plexus). Its functional role in the kidney is less significant compared to the sympathetic system. * **Afferent (Pain) fibers:** Travel with the sympathetic nerves to the T10–L1 spinal segments. ### 2. Why Other Options are Incorrect * **A. Lumbar plexus:** This plexus (L1–L4) provides motor and sensory innervation to the lower abdominal wall, anterior/medial thigh, and inguinal region (e.g., femoral and obturator nerves). It does not provide direct autonomic innervation to the renal parenchyma. * **C. Inferior mesenteric nerve:** This plexus primarily supplies the distal one-third of the transverse colon, descending colon, sigmoid colon, and rectum. It is located much lower than the renal arteries. ### 3. High-Yield Clinical Pearls for NEET-PG * **Renal Colic:** Pain from a kidney stone (ureteric colic) is referred to the **"loin to groin"** area. This is because the kidney and upper ureter share the T10–L1 dermatomes. * **Nerve Distribution:** The nerves follow the renal artery into the kidney substance to reach the afferent and efferent arterioles and the renal tubules. * **Denervated Kidney:** In renal transplantation, the donor kidney is completely denervated. Despite this, the kidney functions normally because its primary autoregulation (myogenic and tubuloglomerular feedback) is independent of the extrinsic nerve supply [1].

Question 356: In the human kidney, a renal papilla projects directly into which structure?

A. Ureter
B. Major calyx
C. Minor calyx (Correct Answer)
D. Renal pyramid

Explanation: The renal papilla is the apex of the renal pyramid, pointing toward the renal sinus. It represents the site where the collecting ducts (ducts of Bellini) converge to discharge urine. **Why the correct answer is right:** The **minor calyx** is a cup-shaped structure that surrounds the renal papilla. Each minor calyx receives urine directly from one or more papillae. This is the first step in the macroscopic drainage system of the kidney. **Analysis of incorrect options:** * **Ureter:** This is the final muscular tube that carries urine from the renal pelvis to the bladder. It is located far downstream from the papilla. * **Major calyx:** These are formed by the union of two to three minor calyces. They do not interface directly with the papillae. * **Renal pyramid:** The papilla is actually a *part* of the renal pyramid (specifically its apical portion). A structure cannot project "into" itself in this anatomical context. **High-Yield Clinical Pearls for NEET-PG:** * **Area Cribrosa:** The surface of the renal papilla contains 10–25 small openings of the papillary ducts; this perforated area is called the area cribrosa. * **Sequence of Drainage:** Renal Papilla → Minor Calyx → Major Calyx → Renal Pelvis → Ureter. * **Clinical Correlation:** **Renal Papillary Necrosis** (seen in Diabetes Mellitus, Sickle Cell Trait, and Chronic Analgesic abuse) involves sloughing of these papillae, which can lead to ureteric obstruction and gross hematuria. * **Numbering:** There are typically 8–12 minor calyces and 2–3 major calyces in a human kidney.

Question 357: The inguinal ligament forms the boundaries of which anatomical space?

A. Femoral triangle
B. Hesselbach's triangle
C. Both femoral triangle and Hesselbach's triangle (Correct Answer)
D. Neither

Explanation: The **inguinal ligament** (Poupart’s ligament) is a key anatomical landmark formed by the lower border of the external oblique aponeurosis, extending from the anterior superior iliac spine (ASIS) to the pubic tubercle. It serves as a boundary for several critical spaces in the groin [1]. ### Why Option C is Correct: The inguinal ligament contributes to the boundaries of both triangles: 1. **Femoral Triangle:** The inguinal ligament forms the **superior boundary (base)** of this triangle. The other boundaries are the medial border of the sartorius (lateral) and the medial border of the adductor longus (medial). 2. **Hesselbach’s Triangle (Inguinal Triangle):** The inguinal ligament forms the **inferior boundary (base)**. The other boundaries are the lateral border of the rectus abdominis (medial) and the inferior epigastric artery (lateral) [1]. ### Analysis of Incorrect Options: * **Option A & B:** While the ligament is a boundary for both, selecting only one is incomplete. In NEET-PG, when a structure serves as a common boundary for two major clinical spaces, the "Both" option is the most accurate anatomical description. ### High-Yield Clinical Pearls for NEET-PG: * **Mid-inguinal point:** Midpoint between ASIS and pubic symphysis (site of femoral artery pulsation). * **Midpoint of inguinal ligament:** Midpoint between ASIS and pubic tubercle (site of the deep inguinal ring). * **Clinical Significance:** Hesselbach’s triangle is the site through which **direct inguinal hernias** protrude, while the femoral triangle contains the femoral canal, the site for **femoral hernias** [1]. * **Mnemonic for Femoral Triangle contents (Lateral to Meidal):** **NAV**e**L** (Nerve, Artery, Vein, Empty space/Canal, Lymphatics).

Question 358: What is the correct order of structures in the porta hepatis?

A. Right anterior - Portal vein; Posterior - Hepatic artery; Left anterior - Bile duct
B. Right anterior - Bile duct; Posterior - Hepatic artery; Left anterior - Portal vein (Correct Answer)
C. Right anterior - Portal vein; Posterior - Bile duct; Left anterior - hepatic artery
D. Right anterior - Hepatic artery; Posterior - Portal vein; Left anterior - Bile duct

Explanation: The **Porta Hepatis** (hilum of the liver) is a deep transverse fissure on the visceral surface of the liver through which neurovascular structures enter and exit [1]. Understanding the spatial arrangement of the "Portal Triad" at this site is a high-yield topic for NEET-PG. ### 1. The Correct Arrangement The structures at the porta hepatis are arranged in a specific triangular relationship [2]: * **Anterior-Right:** Common Hepatic Duct (Bile duct) * **Anterior-Left:** Hepatic Artery Proper * **Posterior:** Portal Vein **Mnemonic:** Remember **"V-A-D"** from posterior to anterior: **V**ein (Posterior), **A**rtery (Middle/Left), **D**uct (Right). Alternatively, remember that the **D**uct is on the **D**exter (Right) side. ### 2. Analysis of Options * **Option B (Correct):** Correctly identifies the Bile duct as right-anterior, the Hepatic artery as left-anterior (medial to the duct), and the Portal vein as the most posterior structure [2]. * **Option A & C:** Incorrect because the Portal vein is never the most anterior structure; its posterior position protects it while allowing the more rigid artery and duct to sit superficially. * **Option D:** Incorrectly places the Hepatic artery on the right. In the free edge of the lesser omentum, the bile duct always stays to the right to facilitate its course toward the duodenum [2]. ### 3. Clinical Pearls for NEET-PG * **Pringle’s Maneuver:** Clamping the hepatoduodenal ligament (containing these structures) to control bleeding during liver surgery. * **Contents:** Besides the triad, the porta hepatis contains hepatic nerves (sympathetic/parasympathetic) and lymph nodes (cystic node of Lund). * **Epiploic Foramen (of Winslow):** These structures form the **anterior boundary** of this foramen. * **Segmental Anatomy:** At the porta hepatis, the artery and duct divide into right and left branches before entering the liver parenchyma [1].

Question 359: Which of the following peritoneal recesses is constantly present in infants but disappears with age?

A. Intersigmoid recess (Correct Answer)
B. Superior ileocecal recess
C. Inferior ileocecal recess
D. Superior duodenal recess

Explanation: Explanation: The **intersigmoid recess** is a funnel-shaped peritoneal pocket formed by the V-shaped attachment of the sigmoid mesocolon to the posterior abdominal wall [1]. Its apex lies at the bifurcation of the left common iliac artery, with the left ureter passing behind it. **Why it is the correct answer:** This recess is a developmental landmark. It is **constantly present in infants** but frequently disappears as the individual ages due to the progressive adhesion of the sigmoid mesocolon to the posterior parietal peritoneum [1]. In adults, it may be present, absent, or significantly reduced in size. **Analysis of Incorrect Options:** * **Superior and Inferior Ileocecal Recesses:** These are formed by the vascular and ileocaecal folds near the terminal ileum. While they vary in size, they are generally permanent structures and do not characteristically disappear with age. * **Superior Duodenal Recess:** Located to the left of the duodenojejunal flexure, this is a common site for internal hernias. Like the ileocecal recesses, it is a stable anatomical feature throughout life when present. **High-Yield NEET-PG Pearls:** * **Clinical Significance:** The intersigmoid recess is a potential site for an **internal hernia**, where a loop of the small intestine can become trapped (strangulated). * **Surgical Landmark:** The **left ureter** is the most important structure related to this recess; it lies immediately posterior to the apex of the recess [1]. * **Paradoxical Fact:** While many peritoneal fossae are "acquired" through variations in gut rotation, the intersigmoid is unique for its developmental regression.

Question 360: In a female with an indirect inguinal hernia, the herniated mass lies along the side of which structure as it traverses the inguinal canal?

A. Iliohypogastric nerve
B. Ovarian artery and vein
C. Pectineal ligament
D. Round ligament of the uterus (Correct Answer)

Explanation: **Explanation:** The inguinal canal is an oblique passage through the lower abdominal wall. In males, it transmits the spermatic cord, while in females, it transmits the **round ligament of the uterus**. An **indirect inguinal hernia** occurs when abdominal contents protrude through the deep inguinal ring, lateral to the inferior epigastric vessels [1]. This protrusion follows the path of the *processus vaginalis* (which normally obliterates) [2]. In females, the herniated mass traverses the inguinal canal alongside the round ligament of the uterus, potentially extending toward the labia majora. **Analysis of Options:** * **Round ligament of the uterus (Correct):** It is the female homologue of the gubernaculum/spermatic cord and is the primary structure occupying the female inguinal canal. * **Iliohypogastric nerve (Incorrect):** This nerve pierces the internal oblique muscle and runs above the inguinal canal; it does not travel through the canal itself. The *ilioinguinal nerve*, however, does pass through part of the canal. * **Ovarian artery and vein (Incorrect):** These structures are contained within the suspensory ligament of the ovary and descend into the pelvis to reach the ovaries; they do not enter the inguinal canal. * **Pectineal ligament (Incorrect):** Also known as Cooper’s ligament, this is a reflection of the lacunar ligament along the pectineal line of the basics. It forms the floor of the femoral canal, not the inguinal canal. **High-Yield NEET-PG Pearls:** * **Homology:** The round ligament of the uterus is the remnant of the **gubernaculum**. * **Anatomy:** Indirect hernias are **lateral** to the inferior epigastric artery; direct hernias are **medial** (within Hesselbach’s triangle) [3]. * **Nerve Injury:** The **ilioinguinal nerve** (L1) is the most commonly injured nerve during open inguinal hernia repair, leading to numbness in the labia majora or scrotum.

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

Abdomen — MCQs

Abdomen — MCQs

On this page

Practice by Chapter

Want unlimited practice?