Abdomen Practice Questions

Q: Which location of a renal stone is most likely to cause pain radiating to the medial side of the thigh and perineum in males due to the stone slipping?

At the pelvic brim. The location of pain from a ureteric stone depends on the spinal segments supplying the specific part of the ureter. The ureter has three primary sites of anatomical narrowing where stones commonly lodge. **1. Why Option A is Correct:** When a stone is at the **pelvic brim** (where the ureter crosses the common iliac artery), the pain is mediated by the **Genitofemoral nerve (L1, L2)**. * The **femoral branch** supplies the skin over the femoral triangle. * The **genital branch** supplies the scrotum in males (perineum) and the skin of the adjacent medial thigh. As the stone slips or lodges here, the irritation of these nerve roots causes classic referred pain to the **medial thigh, scrotum/testis, and perineum.** **2. Analysis of Incorrect Options:** * **Option B (Intramural opening):** This is the narrowest part of the ureter. Pain here typically refers to the tip of the penis or the bladder neck (S2-S4 segments), often associated with strangury (painful frequency). * **Option C (Ureteropelvic junction):** Pain from the upper ureter is mediated by **T10-L1** segments. This causes "loin to groin" pain, primarily felt in the back (renal angle) and the hypochondrium. * **Option D (Crossing of gonadal vessels):** While a site of potential narrowing, it is not one of the "classic three" constrictions. Pain here is similar to the upper ureter (T11-T12) and does not typically reach the perineum. **Clinical Pearls for NEET-PG:** * **The Three Constrictions:** 1. Ureteropelvic junction (narrowest in some texts), 2. Pelvic brim (crossing iliacs), 3. Vesicoureteric junction (narrowest anatomical point). * **Nerve Supply:** Upper ureter (T10-L1), Lower ureter (L1-L2), Intramural (S2-S4). * **Cremasteric Reflex:** Also mediated by the Genitofemoral nerve (L1, L2); stone passage can sometimes trigger or abolish this reflex.

Q: The left gastric artery is a branch of which of the following?

Splenic artery. The **Celiac Trunk** is the primary artery supplying the foregut. It arises from the abdominal aorta at the level of T12 and divides into three main branches: the Left Gastric Artery, the Common Hepatic Artery, and the **Splenic Artery**. [1] The **Splenic Artery** is the largest branch of the celiac trunk. It follows a tortuous course along the superior border of the pancreas. Before reaching the hilum of the spleen, it gives off several branches, including the **short gastric arteries** and the **left gastroepiploic (gastro-omental) artery**. Therefore, the left gastroepiploic artery is a direct branch of the splenic artery. **Analysis of Options:** * **Option B (Left gastroduodenal artery):** This is a distractor. The gastroduodenal artery is a branch of the common hepatic artery and typically divides into the right gastroepiploic and superior pancreaticoduodenal arteries. * **Option C (Left gastroepiploic artery):** This is the vessel *being* branched, not the parent vessel. * **Option D (Portal vein):** This is a venous structure responsible for drainage, not arterial supply. [2] **NEET-PG High-Yield Pearls:** 1. **Tortuosity:** The splenic artery is the most tortuous artery in the body (to allow for gastric distension and splenic movement). 2. **Stomach Blood Supply:** The **lesser curvature** is supplied by the right and left gastric arteries, while the **greater curvature** is supplied by the right and left gastroepiploic arteries. 3. **Clinical Correlation:** In cases of gastric ulcers on the posterior wall of the stomach, the splenic artery is at risk of erosion, leading to massive hemorrhage.

Q: A 27-year-old woman has suffered a gunshot wound to her mid abdomen. After examining the patient's angiogram, a trauma surgeon locates the source of bleeding from pairs of veins that typically terminate in the same vein. Which of the following veins are damaged?

Left and right hepatic veins. ***Left and right hepatic veins*** - Both the **left and right hepatic veins** drain directly into the **inferior vena cava (IVC)** at the same anatomical level, making them true pairs that terminate in the same vessel. - Located in the **mid-abdominal region** where the gunshot wound occurred, consistent with the clinical presentation and angiographic findings. *Left and right ovarian veins* - These veins have **asymmetric drainage patterns**: the right ovarian vein drains into the **IVC**, while the left ovarian vein drains into the **left renal vein**. - They do not terminate in the same vessel, making this option inconsistent with the question's description of paired veins with common termination. *Left and right gastroepiploic veins* - The **right gastroepiploic vein** drains into the **superior mesenteric vein (SMV)**, while the **left gastroepiploic vein** drains into the **splenic vein**. - These veins have different drainage pathways and do not terminate in the same vessel, ruling out this option. *Left and right colic veins* - The **right colic vein** typically drains into the **superior mesenteric vein (SMV)**, while the **left colic vein** drains into the **inferior mesenteric vein (IMV)**. - These vessels have distinct venous drainage systems and do not share a common termination point.

Q: Ureteric constructions are seen at all the following positions, EXCEPT:

Ischial spine. The ureter is a muscular tube approximately 25 cm long that transports urine from the kidney to the bladder. Along its course, it exhibits specific areas of physiological narrowing. These sites are clinically significant as they are the most common locations for **ureteric calculi (stones)** to become impacted. ### Why "Ischial Spine" is the Correct Answer: While the ureter does pass near the ischial spine as it curves anteromedially to enter the bladder, this is **not** a site of physiological constriction. The ureter maintains its normal caliber at this level. ### Explanation of Incorrect Options (Sites of Constriction): There are three primary sites of ureteric constriction: * **A. Ureteropelvic Junction (UPJ):** The first constriction occurs where the wide renal pelvis tapers into the narrow ureter. * **C. Crossing of Iliac Artery:** The second constriction occurs where the ureter crosses the pelvic brim, specifically over the bifurcation of the **common iliac artery** (or the start of the external iliac artery). * **B. Ureterovesical Junction (UVJ):** The third and **narrowest** part of the entire ureter is its intramural passage through the muscular wall of the urinary bladder [1]. ### NEET-PG High-Yield Clinical Pearls: * **Narrowest Point:** The Ureterovesical junction (UVJ) is the most common site for stone impaction. * **Blood Supply:** The ureter receives a segmental blood supply. In the abdomen, the supply comes from the **medial** side (renal, gonadal arteries), while in the pelvis, it comes from the **lateral** side (internal iliac branches) [1]. This is crucial for surgeons to avoid devascularization. * **Water Under the Bridge:** In females, the ureter passes **posterior/inferior** to the uterine artery. * **Pain Referral:** Ureteric colic typically radiates from "loin to groin" (T11–L2 dermatomes).

Q: Surgical lobes of the liver are divided on the basis of which of the following structures?

Hepatic veins and portal vein. The surgical (functional) division of the liver is based on the **Couinaud classification**, which divides the liver into eight independent segments [1]. This division is fundamentally determined by the distribution of the **portal triad** (portal vein, hepatic artery, and bile duct) and the drainage of the **hepatic veins** [1]. 1. **Why Option B is correct:** The liver is divided into right and left surgical lobes by **Cantlie’s line**, an imaginary plane passing from the gallbladder fossa to the IVC. This plane contains the **Middle Hepatic Vein**. Each surgical lobe has its own independent blood supply (from the **Portal Vein** and Hepatic Artery) and biliary drainage [1]. In surgical practice, the hepatic veins act as longitudinal boundaries (intersegmental), while the portal vein branches define the center of the segments (intrasegmental) [1]. 2. **Why other options are incorrect:** * **Options A, C, and D:** While the hepatic artery and bile ducts follow the portal vein branches (forming the portal triad), they are not the primary landmarks used to define the major surgical lobes in isolation. The surgical division specifically relies on the vascular "watershed" areas created by the hepatic veins and the primary bifurcation of the portal vein. **High-Yield Clinical Pearls for NEET-PG:** * **Cantlie’s Line:** Separates the right and left surgical lobes. It is NOT the same as the Falciform ligament (which divides the liver anatomically) [1]. * **Segment IV (Quadrate Lobe):** Belongs to the **Left** surgical lobe but the **Right** anatomical lobe. * **Caudate Lobe (Segment I):** Unique because it receives blood from both right and left portal triads and drains directly into the IVC, bypassing the three main hepatic veins [1]. * **Glisson’s Capsule:** The connective tissue sheath that surrounds the portal triad components as they enter the liver segments.

Q: A 50-year-old male, a known case of diverticulosis of the colon, presents with complaints of left lower quadrant pain and bloody stools. He is scheduled for follow-up. The physician begins the workup with an appropriate test of the sigmoid colon by recalling which of its specific features?

Has teniae coli and epiploic appendages. ### Explanation **Correct Option: B (Has teniae coli and epiploic appendages)** The sigmoid colon is a part of the large intestine, which is morphologically distinguished from the small intestine by three cardinal features: **teniae coli** (three longitudinal muscle bands), **haustrations** (sacculations), and **omental (epiploic) appendages** (fat-filled peritoneal pouches). In cases of diverticulosis, these features are clinically significant as diverticula typically herniate between the teniae coli where the nutrient vessels (vasa recta) pierce the muscularis propria [1]. **Analysis of Incorrect Options:** * **Option A:** The sigmoid colon is drained by the **sigmoid veins**, which flow into the inferior mesenteric vein (IMV). The IMV joins the splenic vein to form the portal vein; thus, it is drained by the **portal venous system**, not the systemic system. * **Option C:** The sigmoid colon is a **hindgut derivative** [1]. Parasympathetic innervation for the hindgut (from the distal 1/3rd of the transverse colon to the upper anal canal) is supplied by the **pelvic splanchnic nerves (S2–S4)**, not the vagus nerve (which supplies the foregut and midgut). * **Option D:** The blood supply to the sigmoid colon comes from the **sigmoid branches of the Inferior Mesenteric Artery (IMA)**. The Superior Mesenteric Artery (SMA) supplies the midgut structures. **NEET-PG High-Yield Pearls:** * **Diverticulosis Site:** Most common in the **sigmoid colon** due to high intraluminal pressure and smaller diameter. * **Teniae Coli:** These three bands converge at the **base of the appendix**, serving as a surgical landmark for locating it. * **Watershed Areas:** The **splenic flexure (Griffith’s point)** and the **rectosigmoid junction (Sudek’s point)** are highly susceptible to ischemic colitis as they represent the borders of SMA/IMA and IMA/Iliac artery territories respectively.

Q: A 43-year-old woman is admitted to the emergency department with esophageal pain and hematemesis after swallowing a fish bone. An endoscopic examination reveals perforation of the intraabdominal portion of the esophageal wall. Which of the following arteries is most likely injured?

Branches of left gastric. The esophagus is a muscular tube with a segmental blood supply that varies according to its anatomical location. The question specifies a perforation in the **intraabdominal portion** of the esophagus. 1. **Why Option A is Correct:** The intraabdominal esophagus (the distal 2–3 cm) and the cardia of the stomach are primarily supplied by the **esophageal branches of the left gastric artery** (a branch of the celiac trunk) and the **left inferior phrenic artery**. Therefore, a perforation in this specific segment is most likely to injure these vessels. 2. **Why Incorrect Options are Wrong:** * **Option B (Bronchial):** Bronchial arteries supply the **middle third** of the esophagus (thoracic portion) along with direct esophageal branches from the aorta. * **Option C (Thoracic intercostal):** These do not typically provide the primary blood supply to the esophagus; the thoracic portion is supplied by the aorta and bronchial arteries. * **Option D (Branches of right gastric):** The right gastric artery supplies the lesser curvature of the **distal stomach (pylorus)**, not the esophagus. **High-Yield NEET-PG Pearls:** * **Segmental Supply:** * *Cervical:* Inferior thyroid artery. * *Thoracic:* Bronchial arteries and esophageal branches of the Thoracic Aorta. * *Abdominal:* Left gastric artery and Left inferior phrenic artery. * **Venous Drainage:** The abdominal esophagus drains into the **left gastric vein** (portal system). This is a critical site for **porto-systemic anastomosis**; obstruction in the portal vein leads to esophageal varices. * **Constrictions:** The esophagus has four anatomical constrictions; the most common site for foreign body (like a fish bone) entrapment is the first constriction (Cricopharyngeus muscle) [1].

Q: Which of the following statements is TRUE about the Lumbar plexus?

The root value of the Genitofemoral nerve is L1 and L2.. ### Explanation The **Lumbar Plexus** is formed within the substance of the Psoas major muscle by the anterior rami of the first three lumbar nerves and the greater part of the fourth lumbar nerve (L1–L4). **Why Option D is Correct:** The **Genitofemoral nerve** arises from the **L1 and L2** nerve roots. It pierces the Psoas major and divides into two branches: the genital branch (enters the inguinal canal) and the femoral branch (supplies the skin over the femoral triangle). **Analysis of Incorrect Options:** * **Option A:** The **Femoral nerve** (L2–L4) is formed by the **posterior divisions** of the anterior rami. The Obturator nerve (L2–L4) is formed by the *ventral (anterior) divisions*. * **Option B:** The **Lateral Cutaneous nerve of the thigh** has a root value of **L2 and L3**. It passes under the inguinal ligament, medial to the ASIS. * **Option C:** The **Nervus furcalis** (forked nerve) is typically **L4**. It is so named because it divides to contribute to both the lumbar and the sacral plexuses. **Clinical Pearls for NEET-PG:** 1. **Meralgia Paraesthetica:** Compression of the Lateral Cutaneous nerve of the thigh (L2, L3) under the inguinal ligament, causing pain/numbness on the lateral thigh. 2. **Cremasteric Reflex:** The afferent limb is the femoral branch of the genitofemoral nerve (and ilioinguinal nerve), while the efferent limb is the **genital branch of the genitofemoral nerve (L1, L2)**. 3. **Iliohypogastric & Ilioinguinal nerves:** Both arise from **L1** only. 4. **Obturator Nerve:** The only nerve of the lumbar plexus that emerges from the **medial** border of the Psoas major.

Q: Identify the liver segment marked 'F' as per Couinaud's classification?

IV. ***IV*** - Segment IV corresponds to the **left medial segment** or **quadrate lobe**, located between the **middle hepatic vein** and **falciform ligament**. - This segment is anatomically positioned **anterior to the porta hepatis** and is commonly involved in **hepatobiliary surgeries**. *II* - Segment II is the **left lateral superior segment**, located in the **upper portion** of the left lobe above the **left portal vein**. - It lies **lateral to the falciform ligament** and is supplied by the **left hepatic artery** and **left portal vein**. *III* - Segment III is the **left lateral inferior segment**, positioned in the **lower portion** of the left lobe below the **left portal vein**. - This segment is located **lateral to the umbilical fissure** and has distinct vascular supply from the **left hepatic system**. *V* - Segment V is the **right anterior inferior segment**, located in the **lower right portion** of the liver below the **right portal vein**. - It is positioned **medial to the right hepatic vein** and **anterior to the gallbladder fossa**.

Question 1

Which location of a renal stone is most likely to cause pain radiating to the medial side of the thigh and perineum in males due to the stone slipping?

Accepted Answer

At the pelvic brim

Answer

At the intramural opening of the ureter

Answer

At the junction of the ureter and renal pelvis

Answer

At the crossing of the gonadal vessels and the ureter

Question 2

The left gastric artery is a branch of which of the following?

Accepted Answer

Splenic artery

Answer

Left gastroduodenal artery

Answer

Left gastroepiploic artery

Answer

Portal vein

Question 3

A 27-year-old woman has suffered a gunshot wound to her mid abdomen. After examining the patient's angiogram, a trauma surgeon locates the source of bleeding from pairs of veins that typically terminate in the same vein. Which of the following veins are damaged?

Accepted Answer

Left and right hepatic veins

Answer

Left and right ovarian veins

Answer

Left and right gastroepiploic veins

Answer

Left and right colic veins

Question 4

Ureteric constructions are seen at all the following positions, EXCEPT:

Accepted Answer

Ischial spine

Answer

Ureteropelvic junction

Answer

Ureterovesical junction

Answer

Crossing of iliac artery

Question 5

While exposing the kidney from behind, which of the following nerves is least likely to be injured?

Accepted Answer

Lateral cutaneous nerve of the thigh

Answer

Ilioinguinal nerve

Answer

Subcostal nerve

Answer

Iliohypogastric nerve

Question 6

Surgical lobes of the liver are divided on the basis of which of the following structures?

Accepted Answer

Hepatic veins and portal vein

Answer

Bile ducts

Answer

Hepatic artery and hepatic vein

Answer

Hepatic artery and bile ducts

Question 7

A 50-year-old male, a known case of diverticulosis of the colon, presents with complaints of left lower quadrant pain and bloody stools. He is scheduled for follow-up. The physician begins the workup with an appropriate test of the sigmoid colon by recalling which of its specific features?

Accepted Answer

Has teniae coli and epiploic appendages

Answer

Is drained by systemic veins

Answer

Receives parasympathetic fibers from the vagus nerve

Answer

Receives its blood from the superior mesenteric artery

Question 8

A 43-year-old woman is admitted to the emergency department with esophageal pain and hematemesis after swallowing a fish bone. An endoscopic examination reveals perforation of the intraabdominal portion of the esophageal wall. Which of the following arteries is most likely injured?

Accepted Answer

Branches of left gastric

Answer

Bronchial

Answer

Thoracic intercostal

Answer

Branches of right gastric

Question 9

Which of the following statements is TRUE about the Lumbar plexus?

Accepted Answer

The root value of the Genitofemoral nerve is L1 and L2.

Answer

The femoral nerve carries contributions from the ventral divisions of anterior rami of L2 to L4.

Answer

The root value of the Lateral Cutaneous nerve of the thigh is L3 and L4.

Answer

L3 is also known as Nervus furcalis.

Question 10

Identify the liver segment marked 'F' as per Couinaud's classification?

Accepted Answer

IV

Answer

II

Answer

III

Answer

V

Abdomen — MCQs

Abdomen — MCQs

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