Abdomen — MCQs

Abdomen Indian Medical PG Practice Questions and MCQs

Question 761: Inferior epigastric artery forms the boundary of?

A. Femoral triangle
B. Hesselbach's triangle (Correct Answer)
C. Adductor canal
D. Popliteal triangle

Explanation: ***Hesselbach's triangle*** - The **inferior epigastric artery** forms the superolateral border of Hesselbach's triangle [1]. - This triangle is clinically significant as it is a common site for **direct inguinal hernias** due to its relative weakness [1]. *Femoral triangle* - The femoral triangle is bounded by the **inguinal ligament superiorly**, the **sartorius muscle laterally**, and the **adductor longus muscle medially**. - It contains the **femoral nerve**, artery, and vein. *Adductor canal* - The adductor canal is an intermuscular tunnel located in the **thigh**, containing the **femoral artery and vein** and the **saphenous nerve**. - Its boundaries are the **vastus medialis**, adductor longus/magnus, and sartorius muscles. *Popliteal triangle* - This term is not a standard anatomical triangle. The correct term is the **popliteal fossa**, which is a diamond-shaped space behind the knee joint. - The popliteal fossa contains structures such as the **popliteal artery and vein**, tibial nerve, and common fibular nerve.

Question 762: What is the most dependent part of the peritoneal cavity in a female in the standing position?

A. Vesicouterine pouch
B. Paracolic gutter
C. Pouch of Douglas (Correct Answer)
D. None of the options

Explanation: ***Pouch of Douglas*** - The **rectouterine pouch** (Pouch of Douglas) is the most dependent part of the peritoneal cavity in females when standing. - It lies between the **rectum posteriorly** and the **uterus anteriorly**, extending down to the posterior fornix of the vagina [1]. - Due to gravity, any free fluid in the peritoneal cavity (blood, pus, ascitic fluid) collects here in the upright position. - **Clinical significance:** This is why culdocentesis (needle aspiration through the posterior vaginal fornix) can detect intraperitoneal fluid [1]. *Vesicouterine pouch* - Located between the **uterus posteriorly** and the **bladder anteriorly** [1]. - It is **superior** to the Pouch of Douglas and therefore not the most dependent part. - Fluid would collect in the Pouch of Douglas before reaching this pouch in a standing position. *Paracolic gutter* - The **paracolic gutters** are peritoneal recesses lateral to the ascending and descending colon. - While they can collect fluid, they are **not the lowest point** in the peritoneal cavity in an upright position. - The right paracolic gutter can serve as a pathway for fluid to spread between the pelvis and subphrenic spaces. *None of the options* - This is incorrect as the **Pouch of Douglas** is definitively the most dependent part of the peritoneal cavity in females in the standing position. - It is a well-established anatomical fact taught in all standard anatomy textbooks.

Question 763: A surgeon removes a part of the liver located to the left of the falciform ligament. Which segments of the liver are removed?

A. Segments I & IV
B. Segments V & VI
C. Segments VII & VIII
D. Segments II & III (Correct Answer)

Explanation: ***Segments II & III*** - The liver segments are defined by their **vascular supply** originating from the **portal vein** and **hepatic artery**, and their **biliary drainage** [1]. - The **falciform ligament** separates the **left lobe** of the liver into **medial** and **lateral** sections. The portion to its left corresponds to the lateral left lobe, which includes **segments II and III** [1, 2]. *Segments I & IV* - **Segment I** (`caudate lobe`) is located **posteriorly**, independent of the falciform ligament, and is supplied by both the left and right portal and hepatic arterial systems [1]. - **Segment IV** (`quadrate lobe`) is part of the **medial left lobe** and is situated to the **right of the falciform ligament** [1]. *Segments V & VI* - These segments are located in the **right lobe** of the liver, which is to the **right of the main portal fissure**, and are not associated with the falciform ligament's immediate left. - **Segment V** is **anterior** and **inferior**, and **Segment VI** is **posterior** and **inferior** within the right lobe. *Segments VII & VIII* - These segments are also located in the **right lobe** of the liver, specifically in the **superior** aspects [1]. - **Segment VII** is **posterior** and **superior**, while **Segment VIII** is **anterior** and **superior** in the right lobe, far from the falciform ligament.

Question 764: Where is the neurovascular plane located in the anterior abdominal wall?

A. Between external oblique and internal oblique
B. Between internal oblique and transversus abdominis (Correct Answer)
C. Below transversus abdominis
D. Above external oblique

Explanation: ***Between internal oblique and transversus abdominis*** - This space, often referred to as the **transversus abdominis plane (TAP)**, contains the major neurovascular bundles supplying the anterior abdominal wall [1]. - The nerves here are the lower **thoracic (T7-T11)** and **iliohypogastric/ilioinguinal (L1) nerves**, along with accompanying blood vessels [1]. *Between external oblique and internal oblique* - This fascial plane primarily houses some superficial nerves and vessels but not the main neurovascular supply to the abdominal wall muscles. - The major neurovascular bundles for deeper muscle layers and skin are located deeper to the **internal oblique** [1]. *Below transversus abdominis* - Below the **transversus abdominis** muscle lies the **transversalis fascia**, an extraperitoneal fat layer, and then the **peritoneum**. - This deeper region primarily contains retroperitoneal structures and organs, not the main neurovascular plane for the abdominal wall. *Above external oblique* - The layer above the **external oblique** muscle is primarily subcutaneous tissue and skin. - While superficial nerves and vessels are present here, this is not the main neurovascular plane that supplies the muscles of the anterior abdominal wall.

Question 765: Which structure is located immediately posterior to the head of the pancreas?

A. Portal vein (Correct Answer)
B. Splenic artery
C. Inferior mesenteric vein
D. Coeliac trunk

Explanation: ***Portal vein*** - The **portal vein** is formed by the union of the **splenic vein** and the **superior mesenteric vein** (SMV) posterior to the **neck** of the pancreas [1]. - It then runs in a **groove on the posterior surface** of the head of the pancreas, lying anterior to the **inferior vena cava** (IVC). - Among the given options, the portal vein has the most direct posterior relationship to the head of the pancreas. *Splenic artery* - The **splenic artery** runs along the **superior border** of the pancreas, following its body and tail. - It does not lie posterior to the head of the pancreas. - It is a branch of the **celiac trunk** and supplies the spleen. *Inferior mesenteric vein* - The **inferior mesenteric vein** typically drains into the **splenic vein** or the junction of the splenic and superior mesenteric veins. - It ascends **anterior** to the left kidney and does not lie immediately posterior to the head of the pancreas. *Coeliac trunk* - The **celiac trunk** originates from the **abdominal aorta** at the level of T12-L1 vertebra. - It lies **superior and anterior** to the pancreas, giving off the splenic artery, common hepatic artery, and left gastric artery. - It is not located posterior to the head of the pancreas.

Question 766: Which of the following is not a branch of the inferior mesenteric artery?

A. Left colic
B. Middle rectal (Correct Answer)
C. Superior rectal
D. Sigmoidal artery

Explanation: ***Middle rectal artery*** - The **middle rectal artery** [2] is typically a branch of the **internal iliac artery** [2], supplying the middle part of the rectum. - It is not a direct branch of the inferior mesenteric artery. *Left colic artery* - The left colic artery is a direct branch of the **inferior mesenteric artery** [1], supplying the distal transverse colon and descending colon. - It forms an important anastomosis with the middle colic artery [1]. *Superior rectal artery* - The **superior rectal artery** is the terminal branch of the **inferior mesenteric artery**, supplying the upper rectum. - This artery provides the primary arterial supply to the proximal large intestine structures. *Sigmoidal artery* - The **sigmoidal arteries** are typically 2-4 branches arising from the **inferior mesenteric artery**, supplying the sigmoid colon. - These arteries anastomose with branches of the superior rectal and left colic arteries.

Question 767: All are lateral branches of the abdominal aorta, EXCEPT which of the following?

A. Right testicular artery
B. Left renal artery
C. Middle suprarenal artery
D. Celiac trunk (Correct Answer)

Explanation: ***Celiac trunk*** - The **celiac trunk** is an anterior branch of the abdominal aorta, supplying the foregut derivatives. - It arises from the ventral aspect of the aorta, distinguishing it from lateral branches. *Right testicular artery* - The **testicular arteries** (gonadal arteries) are paired lateral branches of the abdominal aorta. - They arise inferior to the renal arteries and descend to supply the testes in males. *Left renal artery* - The **renal arteries** [1] [3] are large paired lateral branches of the abdominal aorta. - They supply the kidneys [2] and typically arise just inferior to the superior mesenteric artery. *Middle suprarenal artery* - The **middle suprarenal arteries** are paired lateral branches, typically arising directly from the abdominal aorta. - They supply the suprarenal (adrenal) glands [2].

Question 768: The left gastroepiploic artery is a branch of which artery?

A. Hepatic artery
B. Celiac artery
C. Superior mesenteric artery
D. Splenic artery (Correct Answer)

Explanation: ***Splenic artery*** - The **splenic artery** is a major branch of the **celiac trunk** that supplies the spleen, pancreas, and part of the stomach. - The **left gastroepiploic artery** (also known as the left gastro-omental artery) originates from the distal part of the splenic artery, near the splenic hilum. *Hepatic artery* - The **hepatic artery** (specifically the common hepatic artery) is a branch of the celiac trunk that primarily supplies the liver, pylorus of the stomach, and part of the duodenum. - It gives rise to the **right gastric artery** and the **gastroduodenal artery**, but not the left gastroepiploic artery. *Celiac artery* - The **celiac artery** (also known as the celiac trunk) is the first major anterior branch of the abdominal aorta, supplying the foregut organs. - It branches into three main arteries: the **left gastric artery**, **splenic artery**, and **common hepatic artery**, but the left gastroepiploic artery is a *secondary* branch off one of these. *Superior mesenteric artery* - The **superior mesenteric artery (SMA)** is a major anterior branch of the abdominal aorta that arises just inferior to the celiac trunk. - It primarily supplies the **midgut** structures, including the small intestine (jejunum and ileum), ascending colon, and proximal two-thirds of the transverse colon, and does not supply the stomach's greater curvature.

Question 769: All of the following nerves are posteriorly related to the kidney, except:

A. Iliohypogastric Nerve
B. Ilioinguinal Nerve
C. Lateral Cutaneous Nerve of the thigh (Correct Answer)
D. Subcostal Nerve

Explanation: ***Lateral Cutaneous Nerve of the thigh*** - This nerve originates from the **lumbar plexus (L2-L3)** and travels across the iliacus muscle, typically becoming superficial near the **anterior superior iliac spine** to supply the lateral thigh. - Its anatomical course is generally **remote from the posterior aspect of the kidney**, making it less likely to be directly related. *Subcostal Nerve* - The **subcostal nerve (T12)** runs inferior to the 12th rib and is directly related to the posterior aspect of the kidney as it passes over the **quadratus lumborum muscle**. - Its proximity makes it a significant posterior relation, especially during surgical approaches to the kidney. *Iliohypogastric Nerve* - The **iliohypogastric nerve (L1)** emerges from the lumbar plexus, running inferior to the subcostal nerve and anterior to the quadratus lumborum [1]. - It traverses the posterior abdominal wall and is therefore closely related to the posterior surface of the kidney [1]. *Ilioinguinal Nerve* - The **ilioinguinal nerve (L1)** often branches from the same trunk as the iliohypogastric nerve and follows a similar course along the posterior abdominal wall [1]. - It also passes over the **quadratus lumborum muscle** and is therefore posteriorly related to the kidney [1].

Question 770: The relation of the left renal vein with the aorta is -

A. Anterior, above the Superior mesenteric artery
B. Anterior, below the Superior mesenteric artery (Correct Answer)
C. Anterior, below the Inferior mesenteric artery
D. Posterior, below the Superior mesenteric artery

Explanation: Anterior, below the Superior mesenteric artery - The left renal vein typically passes anterior to the aorta. - It then runs inferior to the superior mesenteric artery. Anterior, above the Superior mesenteric artery - The renal vein does not typically course above the superior mesenteric artery when it crosses the aorta. - Its usual anatomical position is to pass under this artery. Anterior, below the Inferior mesenteric artery - While anterior to the aorta, the renal vein is positioned more superiorly, at the level of the superior mesenteric artery, not the inferior mesenteric artery. - The inferior mesenteric artery originates much lower on the aorta compared to the renal vein's crossing point. Posterior, below the Superior mesenteric artery - The renal vein is consistently located anterior to the aorta, not posterior. [1] - A posterior relationship would be structurally incorrect for the renal venous drainage into the inferior vena cava.

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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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Abdomen — MCQs

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