Abdomen — MCQs

Abdomen Indian Medical PG Practice Questions and MCQs

Question 781: Dermatome at the umbilicus is

A. T8
B. T10 (Correct Answer)
C. T12
D. L1

Explanation: ***T10*** - The **umbilicus** (belly button) is consistently innervated by the **tenth thoracic (T10) dermatome** [1]. - This anatomical landmark is crucial for **neurological assessment** to pinpoint spinal cord injury levels. *T8* - The **T8 dermatome** is located superior to the umbilicus, roughly at the level of the **xiphoid process**. - Sensory deficits at this level would indicate a lesion higher than the umbilicus. *T12* - The **T12 dermatome** is found inferior to the umbilicus, typically around the **suprapubic region** or just above the inguinal ligament [1]. - A lesion affecting T12 would spare sensation at the umbilicus. *L1* - The **L1 dermatome** innervates the **inguinal region** and the upper parts of the thigh [1]. - This level is significantly lower than the umbilicus.

Question 782: The inferior border of the rectus sheath posteriorly is called the:

A. Arcuate line (Correct Answer)
B. Falx inguinalis
C. Inguinal ligament
D. Internal inguinal ring

Explanation: ***Arcuate line*** - The **arcuate line** marks the inferior extent of the posterior rectus sheath, approximately midway between the umbilicus and the pubic symphysis [1]. - Below this line, the **aponeuroses of all three lateral abdominal muscles** (external oblique, internal oblique, and transversus abdominis) pass anterior to the rectus abdominis muscle, leaving only the transversalis fascia posteriorly [1]. *Falx inguinalis* - The **falx inguinalis**, also known as the conjoined tendon, is formed by the fusion of the distal aponeuroses of the **internal oblique** and **transversus abdominis muscles** [1]. - It inserts onto the pubic crest and pectineal line, providing support to the posterior wall of the **inguinal canal**, but it is not the inferior border of the posterior rectus sheath. *Inguinal ligament* - The **inguinal ligament** is the folded-under inferior border of the **external oblique aponeurosis**. - It spans between the anterior superior iliac spine and the pubic tubercle and forms the floor of the inguinal canal, but it is not part of the rectus sheath. *Internal inguinal ring* - The **internal inguinal ring** is an oval opening in the **transversalis fascia** located superior to the midpoint of the inguinal ligament. - It serves as the deep entrance to the inguinal canal for structures like the spermatic cord or round ligament, unrelated to the posterior rectus sheath's inferior border.

Question 783: The free edge of the falciform ligament encloses which structure?

A. Ligamentum venosum
B. Ligamentum teres (Correct Answer)
C. Superior epigastric vein
D. Portal vein and common bile duct

Explanation: ***Ligamentum teres*** - The **ligamentum teres hepatis** (round ligament of the liver) is a remnant of the **umbilical vein** and is found within the free edge of the falciform ligament [1]. - It runs from the umbilicus to the liver, where it joins the **left branch of the portal vein** [1]. *Ligamentum venosum* - The **ligamentum venosum** is a fibrous remnant of the **ductus venosus** and is located between the caudate lobe and the left lobe of the liver [1]. - It is distinct from the free edge of the falciform ligament; rather, the falciform ligament attaches to the liver's superior and anterior surfaces [1]. *Portal vein and common bile duct* - The **portal vein** and **common bile duct** are major components of the **porta hepatis** and are enclosed within the **hepatoduodenal ligament**, part of the lesser omentum [1]. - These structures are located more posteriorly and inferiorly in relation to the falciform ligament [1]. *Superior epigastric vein* - The **superior epigastric vein** is a continuation of the internal thoracic vein and runs in the anterior abdominal wall. - It is not enclosed by the falciform ligament, which is a peritoneal fold extending from the liver to the anterior abdominal wall [1].

Question 784: Which of the following structures is NOT part of the bed of the stomach?

A. Tail of pancreas
B. Right kidney (Correct Answer)
C. Left suprarenal gland
D. Splenic vein

Explanation: ***Right kidney*** - The **right kidney** is NOT part of the bed of the stomach as it is located on the right side of the posterior abdominal wall - The stomach is predominantly a **left-sided organ** and its bed consists of left-sided structures - The right kidney is situated **too far to the right** and does not come into contact with the posterior surface of the stomach *Splenic vein* - The **splenic vein** lies posterior to the body and tail of the pancreas and is considered part of the stomach bed [1] - It runs in the **splenorenal ligament** along with the splenic artery, posterior to the stomach - While not always emphasized, it is anatomically related to the posterior aspect of the stomach *Left suprarenal gland* - The **left suprarenal (adrenal) gland** is a key component of the stomach bed [1] - Located superior to the left kidney, it lies **directly posterior** to the stomach - Forms part of the posterior wall in contact with the stomach *Tail of pancreas* - The **tail of pancreas** extends towards the splenic hilum and is a major structure forming the stomach bed [1] - Lies **directly posterior** to the body and fundus of the stomach - One of the most important anatomical relations of the stomach posteriorly

Question 785: All the following structures form boundaries of the epiploic foramen, except:

A. Inferior vena cava
B. First part of duodenum
C. Quadrate lobe of liver (Correct Answer)
D. Portal vein

Explanation: ***Quadrate lobe of liver*** - The **quadrate lobe of the liver** forms part of the visceral surface of the liver and is located between the gallbladder and the round ligament, but it does not directly form a boundary of the **epiploic foramen** [1]. - The **epiploic foramen** (Foramen of Winslow) is an opening between the greater and lesser sacs of the peritoneum, whose boundaries are primarily formed by specific ligamentous and vascular structures [1]. *Portal vein* - The **portal vein** is a component of the **portal triad** (which also includes the proper hepatic artery and common bile duct) that forms the **anterior boundary** of the epiploic foramen. - These structures are enclosed within the **hepatoduodenal ligament**, a crucial part of the anterior boundary. *Inferior vena cava* - The **inferior vena cava (IVC)** forms the **posterior boundary** of the epiploic foramen [1]. - It runs along the posterior abdominal wall, behind the structures of the epiploic foramen [1]. *First part of duodenum* - The **first part of the duodenum** forms part of the **inferior boundary** of the epiploic foramen. - Specifically, the superior border of the first part of the duodenum helps define the lower aspect of the foramen's entrance.

Question 786: Short gastric arteries are branches of which vessel?

A. Celiac artery
B. Splenic artery (Correct Answer)
C. Left gastroepiploic artery
D. Right gastroepiploic artery

Explanation: Splenic artery - The **short gastric arteries** originate directly from the terminal portion of the **splenic artery** near the splenic hilum. - They supply the superior part of the **greater curvature** of the stomach. *Celiac artery* - The **celiac artery** is the main trunk from which the splenic artery, common hepatic artery, and left gastric artery branch. - It does not directly give rise to the short gastric arteries. *Left gastroepiploic artery* - The **left gastroepiploic artery** is a branch of the **splenic artery** but does not give rise to the short gastric arteries. - It supplies the greater curvature of the stomach, traveling inferiorly. *Right gastroepiploic artery* - The **right gastroepiploic artery** is a branch of the **gastroduodenal artery**, which in turn comes from the common hepatic artery. - It supplies the greater curvature of the stomach from the right side and is unrelated to the short gastric arteries.

Question 787: Stomach bed is formed by all, except:

A. Crus of diaphragm
B. Left suprarenal gland
C. Left gastric artery (Correct Answer)
D. Splenic artery

Explanation: The left gastric artery is a branch of the celiac trunk and supplies blood to the stomach; it is not an anatomical structure forming the stomach bed [2]. The stomach bed refers to the structures posterior to the stomach that it rests upon. The left crus of the diaphragm is one of the structures that forms part of the stomach bed, supporting the posterior aspect of the stomach. Its presence directly behind the stomach contributes to the anatomical support. The left suprarenal (adrenal) gland lies posterior to the stomach and is considered a component of the stomach bed. Its location provides a direct posterior relation to the stomach. The splenic artery runs along the superior border of the pancreas, posterior to the stomach, and is part of the stomach bed. While it primarily supplies the spleen, its course along the posterior aspect of the stomach makes it a component of the stomach bed [1].

Question 788: Which part of the colon is retroperitoneal and lacks a mesentery?

A. Transverse colon
B. Sigmoid colon
C. Rectum
D. Ascending colon (Correct Answer)

Explanation: Ascending colon - The ascending colon is a retroperitoneal organ [1], meaning it lies behind the peritoneum and is directly affixed to the posterior abdominal wall, thus lacking a true mesentery [1]. - Its peritoneal covering is only anterior and partially lateral, distinguishing it from intraperitoneal portions of the colon. - The descending colon is also retroperitoneal [2], but is not listed as an option here. Transverse colon - The transverse colon is an intraperitoneal organ and is suspended by the transverse mesocolon [1], a fold of peritoneum. - This mesentery allows for significant mobility of the transverse colon within the abdominal cavity. Sigmoid colon - The sigmoid colon is also an intraperitoneal organ and is characterized by its significant sigmoid mesocolon [2]. - This mesentery provides considerable mobility, allowing it to move freely within the pelvis [2]. Rectum - While the rectum is also primarily retroperitoneal and lacks a mesentery in its middle and lower thirds, it is technically not considered part of the "colon proper" in anatomical terminology. - The question specifically asks about the colon, making ascending colon the most appropriate answer among the colonic segments listed.

Question 789: Posterior wall of the inguinal canal is formed by all of the following structures, except which of the following?

A. Parietal peritoneum
B. Interfoveolar ligament
C. Internal oblique muscle (Correct Answer)
D. Fascia transversalis

Explanation: ***Internal oblique muscle*** - The **internal oblique muscle** forms part of the **anterior wall** and the **roof** of the inguinal canal, not the posterior wall [1], [3]. - Its fibers arch over the spermatic cord and contribute to the conjoint tendon (inguinal falx) medially, which does contribute to the posterior wall, but the muscle itself does not [3]. *Interfoveolar ligament* - The **interfoveolar ligament** is a fibrous band lateral to the deep inguinal ring that contributes to the **posterior wall** of the inguinal canal. - It arises from the fascia transversalis and helps reinforce the lateral portion of the posterior wall. *Parietal peritoneum* - The **parietal peritoneum** forms the deepest (most posterior) layer of the **posterior wall** of the inguinal canal, lying posterior to the fascia transversalis with extraperitoneal fat in between [2]. - Although not a strong structural component, it is the innermost layer forming the posterior boundary. *Fascia transversalis* - The **fascia transversalis** is the primary and strongest component forming the majority of the **posterior wall** of the inguinal canal throughout its entire length. - It is a dense fibrous sheet that forms the deep boundary of the canal [4].

Question 790: Bowel can get strangulated in all of the following spaces, except:

A. Paraduodenal recess
B. Omental bursa
C. Rectouterine pouch (Correct Answer)
D. Ileocolic recess

Explanation: ***Rectouterine pouch*** - The **rectouterine pouch** (Pouch of Douglas) is the most dependent part of the peritoneal cavity, and while fluid can collect here, bowel is generally **not trapped or strangulated** due to its open and accessible nature. - Its wide opening and lack of narrow constrictions make bowel incarceration unlikely, though it can accumulate ascites or pus. *Paraduodenal recess* - The **paraduodenal recesses** are potential spaces in the left upper quadrant of the abdomen where portions of the small intestine can herniate, leading to **internal herniation** and strangulation [1]. - These recesses are common sites for internal hernias, which can result in bowel obstruction and ischemic damage [1]. *Omental bursa* - The **omental bursa** (lesser sac) is a potential space posterior to the stomach and lesser omentum; bowel can herniate through the **foramen of Winslow** into this space, leading to **incarceration and strangulation**. - Herniation into the omental bursa is a rare but well-documented cause of bowel obstruction. *Ileocolic recess* - The **ileocolic recess** is a peritoneal space located near the ileocecal junction, which can rarely be a site for small bowel to become trapped, leading to an **internal hernia** and potential strangulation. - This recess, formed by peritoneal folds around the ileocecal valve, can inadvertently trap bowel loops.

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Anterior Abdominal Wall

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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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Applied Anatomy and Clinical Correlations

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Abdomen — MCQs

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