Abdomen Practice Questions

Q: The transpyloric plane passes through which structure?

Pylorus of the stomach. The **Transpyloric Plane (Addison’s Plane)** is a key anatomical landmark in the abdomen. It is a horizontal plane located midway between the suprasternal notch and the pubic symphysis, typically at the level of the **L1 vertebra**. ### Why the Correct Answer is Right: * **Pylorus of the Stomach:** By definition, the plane is named after the pylorus, which lies at this level when the patient is in the supine position. It marks the junction between the stomach and the duodenum. ### Why the Incorrect Options are Wrong: * **Fundus of the stomach:** This is the most superior part of the stomach, located much higher (usually at the level of the 5th intercostal space/T10 level), tucked under the left dome of the diaphragm. * **Fundus of the uterus:** In a non-pregnant state, the uterus is a pelvic organ. Even when gravid, its height varies by gestational week and does not serve as a fixed landmark for the transpyloric plane. * **Fundus of the gallbladder:** While the **neck** of the gallbladder is near this plane, the **fundus** is specifically located where the transpyloric plane intersects the **lateral border of the rectus abdominis** (9th costal cartilage). ### NEET-PG High-Yield Pearls: The transpyloric plane is a "favorite" for examiners because it intersects several vital structures at the **L1 level**: 1. **Hila of the Kidneys:** Left hilum is exactly on the plane; right hilum is slightly below. 2. **Pancreas:** The neck of the pancreas lies on this plane. 3. **Duodenum:** The duodenojejunal flexure and the first part of the duodenum. 4. **Vessels:** Origin of the **Superior Mesenteric Artery** and the formation of the **Portal Vein**. 5. **Spinal Cord:** The conus medullaris typically ends just above or at this level in adults.

Q: The spleen is supplied by all of the following except:

Ligamentum teres. The spleen is an intraperitoneal organ located in the left hypochondrium, almost entirely surrounded by peritoneum and suspended by several ligaments. [1] **Explanation of the Correct Answer:** **D. Ligamentum teres:** This is the correct answer because it has no anatomical relationship with the spleen. The ligamentum teres (round ligament of the liver) is the obliterated remains of the **left umbilical vein**. It extends from the umbilicus to the liver, where it joins the left branch of the portal vein and lies in the free margin of the falciform ligament. **Explanation of Incorrect Options:** * **B. Gastrosplenic ligament:** This connects the hilum of the spleen to the greater curvature of the stomach. It contains the **short gastric vessels** and the **left gastroepiploic vessels**. [1] * **C. Lienorenal (Splenorenal) ligament:** This connects the hilum of the spleen to the left kidney. It is a vital structure as it contains the **tail of the pancreas** and the **splenic artery and vein**. [1] * **A. Phrenicocolic ligament:** While not attached directly to the splenic hilum, it extends from the left colic flexure to the diaphragm. It acts as a "shelf" that supports the lower pole of the spleen, earning it the name *sustentaculum lienis*. **NEET-PG High-Yield Pearls:** 1. **Splenic Artery:** The largest branch of the celiac trunk; it follows a characteristic **tortuous course** along the superior border of the pancreas. 2. **Trauma:** The spleen is the most commonly injured organ in blunt abdominal trauma. 3. **Development:** The spleen develops from the **mesoderm** of the dorsal mesogastrium (unlike most GI organs which are endodermal). 4. **Kehr’s Sign:** Referred pain to the left shoulder due to diaphragmatic irritation by splenic rupture (phrenic nerve, C3-C5).

Q: The inferior mesenteric artery supplies all of the following except?

Right colic flexure. The blood supply of the gastrointestinal tract is determined by embryological origins. The **Inferior Mesenteric Artery (IMA)** is the artery of the **hindgut**, supplying structures from the distal third of the transverse colon down to the upper part of the anal canal [1]. ### Why Option D is Correct The **Right colic flexure (Hepatic flexure)** is a derivative of the **midgut**. Midgut structures are supplied by the **Superior Mesenteric Artery (SMA)** [1]. Specifically, the right colic flexure receives its blood supply from the right colic and middle colic branches of the SMA. Therefore, it is not supplied by the IMA. ### Analysis of Incorrect Options * **Splenic flexure (Option C):** This marks the transition from the midgut to the hindgut. It is supplied by the **left colic artery**, which is the first branch of the IMA [1]. * **Sigmoid colon (Option B):** This is a hindgut structure supplied by the **sigmoid branches** of the IMA [2]. * **Rectum (Option A):** The upper part of the rectum is supplied by the **superior rectal artery**, which is the direct continuation (terminal branch) of the IMA [2]. ### NEET-PG High-Yield Pearls * **Watershed Area:** The splenic flexure (Griffith’s point) is a clinical "watershed" zone where the territories of the SMA and IMA meet [1]. It is highly susceptible to **ischemic colitis** during periods of systemic hypotension. * **Marginal Artery of Drummond:** This is the continuous arterial anastomosis running along the inner border of the colon, connecting the SMA and IMA [1]. * **IMA Level:** The IMA originates from the abdominal aorta at the level of the **L3 vertebra**. * **Hindgut Derivatives:** Distal 1/3 of transverse colon, descending colon, sigmoid colon, rectum, and upper anal canal (above the pectinate line).

Q: Which of the following does not form part of the portal triad in the liver?

Hepatic vein. **Explanation:** The **portal triad** is a distinct anatomical arrangement found at the periphery of the liver lobule, contained within the connective tissue of Glisson’s capsule [1]. It consists of three main structures that travel together throughout the liver parenchyma. **Why Hepatic Vein is the correct answer:** The **Hepatic Veins** are not part of the portal triad. Instead, they are the systemic venous drainage of the liver [2]. They originate as **central veins** (intralobular veins) at the center of each liver lobule, which then coalesce to form the right, middle, and left hepatic veins that drain directly into the **Inferior Vena Cava (IVC)** [2]. **Analysis of Incorrect Options:** * **A. Hepatic Artery:** Specifically the branch of the hepatic artery proper, it supplies oxygenated blood to the hepatocytes and biliary tree [1]. * **C. Bile Duct:** Specifically the interlobular bile ductule, it carries bile (produced by hepatocytes) away from the liver lobule toward the hepatic ducts [1]. * **D. Portal Vein:** Specifically a branch of the portal vein, it brings nutrient-rich, deoxygenated blood from the gastrointestinal tract to the liver [1]. **NEET-PG High-Yield Pearls:** 1. **Location:** The portal triad is located at the angles of the hexagonal **classic liver lobule** [1]. 2. **Porta Hepatis:** At the hilum of the liver (Porta Hepatis), the relationship of these structures from anterior to posterior is: **Bile Duct, Hepatic Artery, and Portal Vein (V-A-D mnemonic: Vein is most posterior, Duct is most anterior).** 3. **Blood Flow:** Remember that blood in the portal vein and hepatic artery flows **centripetally** (toward the central vein), while bile flows **centrifugally** (away from the center toward the triad) [1].

Q: During a scheduled laparoscopic cholecystectomy in a 47-year-old female patient, the resident accidentally clamped the hepatoduodenal ligament instead of the cystic artery. Which of the following vessels would most likely be occluded in this iatrogenic injury?

Proper hepatic artery. **Explanation:** The **hepatoduodenal ligament** is the thickened lateral portion of the lesser omentum that forms the anterior boundary of the epiploic foramen (of Winslow). It contains the **portal triad**, which consists of: 1. **Proper hepatic artery** (anteromedial) [2] 2. **Bile duct** (anterolateral) [1] 3. **Portal vein** (posterior) [2] In this scenario, clamping the hepatoduodenal ligament (a maneuver known clinically as the **Pringle Maneuver**) directly occludes the proper hepatic artery. This vessel is the continuation of the common hepatic artery after it gives off the gastroduodenal artery [2]. **Analysis of Incorrect Options:** * **A. Superior mesenteric artery:** This arises from the abdominal aorta at the level of L1, posterior to the neck of the pancreas. It is not contained within the lesser omentum. * **C. Splenic artery:** This retroperitoneal vessel runs along the superior border of the pancreas and enters the splenorenal ligament, not the hepatoduodenal ligament. * **D. Common hepatic artery:** This vessel originates from the celiac trunk and travels retroperitoneally toward the duodenum. It only becomes the "proper" hepatic artery after giving off the gastroduodenal artery; the common hepatic artery itself is not located within the hepatoduodenal ligament. **NEET-PG High-Yield Pearls:** * **Pringle Maneuver:** Clamping the hepatoduodenal ligament is used to control hepatic bleeding. If bleeding continues despite this maneuver, the source is likely the **inferior vena cava** or **hepatic veins** [2]. * **Cystic Artery:** Usually arises from the **Right Hepatic Artery** within the **Calot’s Triangle** [1] (Boundaries: Cystic duct, Common hepatic duct, and Inferior surface of the liver). * **Epiploic Foramen (Winslow):** The hepatoduodenal ligament is its anterior boundary, while the IVC forms its posterior boundary.

Q: What is the blood supply of the sigmoid colon?

Marginal artery. The sigmoid colon is primarily supplied by the **sigmoid branches** of the Inferior Mesenteric Artery (IMA). However, in the context of this question, the **Marginal Artery (of Drummond)** is the correct answer as it represents the continuous arterial channel formed by the anastomosis of various colic arteries that directly gives off the *vasa recta* to the sigmoid colon [1]. ### Why the options are correct/incorrect: * **Marginal Artery (Correct):** This is a continuous paracolic vessel formed by the anastomosis of the ileocolic, right colic, middle colic, left colic, and sigmoid arteries [1]. It runs along the inner margin of the entire colon and provides the final terminal supply to the sigmoid colon. * **Middle Colic Artery (Incorrect):** This is a branch of the Superior Mesenteric Artery (SMA) and primarily supplies the transverse colon [1]. * **Left Colic Artery (Incorrect):** This is the first branch of the IMA and primarily supplies the descending colon [1]. While it contributes to the marginal artery, it does not directly supply the sigmoid colon. ### High-Yield NEET-PG Pearls: 1. **Sudeck’s Point:** Historically, this was considered a "critical point" at the junction of the last sigmoid artery and the superior rectal artery where the marginal artery was thought to be absent. Clinically, it is a site prone to ischemia during surgeries. 2. **Griffith’s Point:** The splenic flexure is the most common site for ischemic colitis because the anastomosis between the SMA (middle colic) and IMA (left colic) via the marginal artery can be weak here [1]. 3. **Arc of Riolan:** A direct communication between the SMA and IMA, providing a collateral pathway separate from the marginal artery [1].

Q: A 56-year-old male was brought to the emergency department with severe pain in the left flank region. CT examination revealed occlusion of the left renal vein. The condition would impede the blood flow through all the following veins except:

Left subcostal vein. ### Explanation The core concept tested here is the **asymmetry of venous drainage** between the right and left sides of the posterior abdominal wall. **1. Why the Left Subcostal Vein is Correct:** The **left subcostal vein** (the vein below the 12th rib) typically drains directly into the **ascending lumbar vein** or the **azygos/hemiazygos system**. It does not drain into the renal vein. Therefore, an occlusion of the left renal vein will have no impact on the blood flow of the subcostal vein. **2. Why the Other Options are Incorrect:** The left renal vein is longer than the right and acts as a "tributary hub" for several vessels before it crosses the midline to enter the Inferior Vena Cava (IVC). * **Left Adrenal (Suprarenal) Vein:** On the left side, this vein drains directly into the superior aspect of the left renal vein. (On the right, it drains directly into the IVC). * **Left Testicular/Ovarian (Gonadal) Vein:** On the left, this drains into the inferior aspect of the left renal vein at a perpendicular angle. (On the right, it drains directly into the IVC). * **Diaphragmatic (Left Inferior Phrenic) Vein:** This vein typically drains into the left renal vein, often joining the left suprarenal vein first. **3. Clinical Pearls for NEET-PG:** * **Nutcracker Syndrome:** This occurs when the left renal vein is compressed between the **Superior Mesenteric Artery (SMA)** and the **Abdominal Aorta**. * **Left-Sided Varicocele:** Occlusion or compression of the left renal vein leads to retrograde pressure in the left testicular vein, causing a varicocele (often described as a "bag of worms"). This is much more common on the left than the right due to the perpendicular (90°) entry of the left gonadal vein into the renal vein. * **Renal Cell Carcinoma (RCC):** Always check for a left-sided varicocele in elderly patients with suspected RCC, as the tumor can invade the renal vein and obstruct gonadal drainage.

Q: What is true about the inferior mesenteric artery?

Takes part in the formation of the marginal artery. The **Inferior Mesenteric Artery (IMA)** is the artery of the hindgut, arising from the abdominal aorta at the level of **L3** [1]. ### Why Option B is Correct: The IMA contributes to the **Marginal Artery of Drummond**, a continuous arterial channel running along the inner border of the colon [1]. This anastomosis is formed by the communication between the ileocolic, right colic, and middle colic arteries (from the Superior Mesenteric Artery) and the **left colic and sigmoid arteries** (from the Inferior Mesenteric Artery). This provides vital collateral circulation to the large intestine. ### Why Other Options are Incorrect: * **Option A:** The IMA continues as the **Superior Rectal Artery** after crossing the left common iliac artery. The inferior rectal artery is actually a branch of the internal pudendal artery [2]. * **Option C:** The IMA arises directly from the **Abdominal Aorta** at L3, approximately 3-4 cm above the aortic bifurcation. The coeliac trunk arises at T12 [1]. * **Option D:** The IMA supplies the **Hindgut** (from the distal 1/3rd of the transverse colon to the upper part of the anal canal) [1]. The midgut is supplied by the Superior Mesenteric Artery (SMA). ### High-Yield Clinical Pearls for NEET-PG: * **Griffith’s Point:** The splenic flexure is a "watershed area" where the SMA and IMA territories meet. it is the most common site for ischemic colitis [1]. * **Suddeck’s Point:** Historically considered a critical point between the last sigmoid artery and the superior rectal artery, though its clinical significance in surgery is now debated. * **L3 Level:** Remember the mnemonic "IMA is at L3" (3 letters in IMA).

Q: Which part of the large intestine is the appendix attached to?

Sigmoid colon. The question asks for the attachment site of the appendix. Anatomically, the **Vermiform Appendix** is a narrow, worm-like tubular diverticulum that arises from the posteromedial wall of the **Caecum**, approximately 2 cm below the ileocaecal junction. **Note on the provided Answer Key:** There appears to be a discrepancy in the provided key. Anatomically, the **correct answer is B (Caecum)**. The Sigmoid colon (Option D) is located in the left lower quadrant and is not associated with the appendix. **Analysis of Options:** * **Caecum (Correct Anatomical Answer):** The appendix is attached to the caecum where the three **taeniae coli** converge. This convergence is a reliable surgical landmark for locating the base of the appendix during an appendicectomy. * **Sigmoid Colon (Incorrect):** This is the S-shaped part of the large intestine that connects the descending colon to the rectum. It does not possess an appendix. * **Rectum (Incorrect):** The rectum is the terminal part of the large intestine, characterized by the absence of taeniae coli, haustrations, and appendices epiploicae. * **Appendix (Incorrect):** This is the structure itself, not the site of attachment. **NEET-PG High-Yield Pearls:** 1. **Position:** The most common position of the appendix is **Retrocaecal (65%)**, followed by Pelvic (30%). 2. **Blood Supply:** The **Appendicular artery**, a branch of the lower division of the **ileocolic artery**, which is a branch of the Superior Mesenteric Artery (SMA). It is a functional end-artery. 3. **McBurney’s Point:** Located at the junction of the lateral 1/3rd and medial 2/3rds of the line joining the Umbilicus to the Right Anterior Superior Iliac Spine (ASIS). It corresponds to the base of the appendix. 4. **Histology:** Characterized by an abundance of lymphoid follicles in the submucosa, often called the "Abdominal Tonsil."

Q: The kidney is supplied by all of the following structures except:

Fibrous capsule. **Explanation:** The question asks for the structure that does **not** contribute to the **support or fixation** of the kidney. The kidney is maintained in its position within the retroperitoneum by several layers of fascia and fat, which act as a supportive apparatus [1]. 1. **Why Fibrous Capsule is the correct answer:** The **fibrous capsule** is a thin, smooth, and glistening membrane that closely invests the kidney [2]. While it provides structural integrity and protection against infection or trauma, it is **not a supportive structure** that holds the kidney in place. In a healthy kidney, this capsule can be easily stripped away. 2. **Analysis of Incorrect Options (Supportive Structures):** * **Perirenal Fat:** This is a layer of adipose tissue lying between the fibrous capsule and the renal fascia. It acts as a cushion and is a primary factor in maintaining the kidney's position [1]. * **Renal Fascia (Gerota’s Fascia):** A condensation of connective tissue that encloses both the kidney and the suprarenal gland. It anchors the kidneys to the surrounding structures (diaphragm, psoas major, and large vessels) [1]. * **Pararenal Fat:** Located outside the renal fascia, this fat layer fills the paravertebral gutter and provides a further supportive "buffer" for the kidney. **Clinical Pearls for NEET-PG:** * **Nephroptosis (Floating Kidney):** Occurs when there is a deficiency in the supportive fat (perirenal/pararenal), causing the kidney to descend abnormally when the patient stands. * **Renal Fascia Layers:** It has an anterior layer (**Fascia of Toldt**) and a posterior layer (**Fascia of Zuckerkandl**). * **Renal Transplantation:** The kidney is usually placed in the iliac fossa for easy access to the iliac vessels and the bladder [3].

Question 1

The transpyloric plane passes through which structure?

Accepted Answer

Pylorus of the stomach

Answer

Fundus of the stomach

Answer

Fundus of the uterus

Answer

Fundus of the gallbladder

Question 2

The spleen is supplied by all of the following except:

Accepted Answer

Ligamentum teres

Answer

Phrenicocolic ligament

Answer

Gastrosplenic ligament

Answer

Lineorenal ligament

Question 3

The inferior mesenteric artery supplies all of the following except?

Accepted Answer

Right colic flexure

Answer

Rectum

Answer

Sigmoid colon

Answer

Splenic flexure

Question 4

Which of the following does not form part of the portal triad in the liver?

Accepted Answer

Hepatic vein

Answer

Hepatic artery

Answer

Bile duct

Answer

Portal vein

Question 5

During a scheduled laparoscopic cholecystectomy in a 47-year-old female patient, the resident accidentally clamped the hepatoduodenal ligament instead of the cystic artery. Which of the following vessels would most likely be occluded in this iatrogenic injury?

Accepted Answer

Proper hepatic artery

Answer

Superior mesenteric artery

Answer

Splenic artery

Answer

Common hepatic artery

Question 6

What is the blood supply of the sigmoid colon?

Accepted Answer

Marginal artery

Answer

Middle colic artery

Answer

Left colic artery

Answer

All of the above

Question 7

A 56-year-old male was brought to the emergency department with severe pain in the left flank region. CT examination revealed occlusion of the left renal vein. The condition would impede the blood flow through all the following veins except:

Accepted Answer

Left subcostal vein

Answer

Left adrenal vein

Answer

Left testicular vein

Answer

Diaphragmatic vein

Question 8

What is true about the inferior mesenteric artery?

Accepted Answer

Takes part in the formation of the marginal artery

Answer

Continues as the inferior rectal artery

Answer

Arises from the coeliac trunk

Answer

Supplies the midgut

Question 9

Which part of the large intestine is the appendix attached to?

Accepted Answer

Sigmoid colon

Answer

Appendix

Answer

Caecum

Answer

Rectum

Question 10

The kidney is supplied by all of the following structures except:

Accepted Answer

Fibrous capsule

Answer

Perirenal fat

Answer

Renal fascia

Answer

Pararenal fat

Abdomen — MCQs

Abdomen — MCQs

On this page

Practice by Chapter

Want unlimited practice?