Abdomen Practice Questions

Q: Which of the following vessels runs through the transverse mesocolon?

Middle colic artery. * **Middle colic artery** - The **middle colic artery** arises from the superior mesenteric artery and supplies the **transverse colon**, traversing between the two layers of the **transverse mesocolon** [1]. - Its location within the mesocolon makes it susceptible to injury during surgical procedures involving the transverse colon [2]. * *Right colic artery* - The **right colic artery** supplies the **ascending colon** and the right colic flexure, typically lying within retroperitoneal tissue and not the transverse mesocolon itself [2]. - It arises from the superior mesenteric artery but branches to supply structures primarily to the right side of the abdominal cavity. * *Left colic artery* - The **left colic artery** arises from the **inferior mesenteric artery** and supplies the descending colon and the left colic flexure [1]. - This vessel is located within the retroperitoneum and is not associated with the transverse mesocolon. * *Iliocolic artery* - The **iliocolic artery** is a terminal branch of the superior mesenteric artery, supplying the **ileum, cecum, appendix**, and beginning of the ascending colon. - It descends retroperitoneally to reach these structures and does not traverse the transverse mesocolon.

Q: What is the posterior relation of the neck of the pancreas?

Origin of portal vein. ***Origin of portal vein*** - The **neck of the pancreas** is intimately associated with the formation of the **hepatic portal vein** [1]. - The **superior mesenteric vein** and **splenic vein** unite behind the pancreatic neck to form the **hepatic portal vein** [1]. *IVC* - The **inferior vena cava (IVC)** lies posterior to the **head of the pancreas**, not the neck. - While it's in proximity, it does not directly relate to the neck in the same way the portal vein does. *Aorta* - The **abdominal aorta** lies posterior to the **body** and **tail of the pancreas**, further superior and to the left. - It is not a direct posterior relation of the pancreatic neck. *Common bile duct* - The **common bile duct** passes through a groove on the posterior surface of the pancreatic **head**, sometimes even embedded within it. - It is not a direct posterior relation of the pancreatic neck, which is a different segment.

Q: Haustrations are present in -

Colon. ***Colon*** - **Haustrations** are characteristic sacculations or pouches that give the colon its segmented appearance [1]. - They are formed by the tonic contractions of the **teniae coli**, which are three distinct bands of longitudinal smooth muscle found in the muscularis externa of the colon. *Duodenum* - The duodenum is the first part of the small intestine and is characterized by **plicae circulares (circular folds)** and **villi**, not haustrations. - Its primary role is chemical digestion and initial absorption, with a smooth, folded inner surface. *Ileum* - The ileum is the final and longest part of the small intestine, featuring **Peyer's patches** (lymphoid nodules) and prominent plicae circulares [2], but lacks haustrations. - Its main function is the absorption of vitamin B12 and bile salts [2]. *Jejunum* - The jejunum is the middle section of the small intestine, known for its tall and numerous **plicae circulares** and villi, making it highly efficient for nutrient absorption. - It does not possess haustrations, which are unique to the large intestine.

Q: Floor of Petit triangle is formed by?

Internal oblique muscle. ***Internal oblique muscle*** - The **Petit triangle** (lumbar triangle) is a landmark defined by the **latissimus dorsi posteriorly**, the **external oblique anteriorly**, and the **iliac crest inferiorly**. - Its **floor** is consistently formed by the **internal oblique muscle**, which lies deep to the external oblique [1]. *Sacrospinalis muscle* - The **sacrospinalis muscle** (erector spinae) is part of the deep back muscles, located medial to the Petit triangle. - It forms part of the **vertebral column's musculature** and is not directly associated with the floor of the Petit triangle. *Rectus abdominis muscle* - The **rectus abdominis muscle** is located medially in the anterior abdominal wall [1]. - It is distinct from the lateral abdominal wall muscles that form the boundaries and floor of the Petit triangle. *Fascia Transversalis layer* - The **fascia transversalis** is a deeper fascial layer lining the abdominal wall. - While it's deep to the internal oblique, the **muscle itself** forms the immediate anatomical floor of the Petit triangle.

Q: Ligament which prevents the spleen from falling in left iliac fossa -

Phrenicocolic ligament. ***Phrenicocolic ligament*** - The **phrenicocolic ligament** is a fold of peritoneum that extends from the left colic flexure to the diaphragm, under the spleen. - It forms a shelf that **supports the spleen** and prevents it from descending into the left iliac fossa. *Lienorenal ligament* - The **lienorenal (splenorenal) ligament** connects the hilum of the spleen to the posterior abdominal wall (specifically over the left kidney) [1]. - While it helps to anchor the spleen, its primary role is not preventing caudal displacement, but rather containing the **splenic artery and vein** and the tail of the pancreas [1]. *Upper pole of right kidney* - The **right kidney** is located on the opposite side of the abdominal cavity from the spleen. - It plays no role in supporting the spleen or preventing its descent. *Sigmoid colon* - The **sigmoid colon** is a part of the large intestine located in the left lower quadrant of the abdomen and pelvis. - It is situated far below the spleen and has no direct anatomical connection or supporting role for the spleen.

Q: Superficial inguinal ring is a defect in the:

External oblique aponeurosis. ***External oblique aponeurosis*** - The **superficial inguinal ring** is a triangular opening in the **aponeurosis of the external oblique muscle** [1]. - It allows passage of the **spermatic cord** in males and the **round ligament of the uterus** in females. *Transverse abdominis aponeurosis* - The **transverse abdominis aponeurosis** contributes to the posterior wall of the **inguinal canal**, but not the superficial inguinal ring itself [2]. - The deepest abdominal muscle, its aponeurosis forms the **conjoint tendon** with the internal oblique aponeurosis. *Internal oblique muscle* - The **internal oblique muscle** forms the arching roof and part of the anterior wall of the **inguinal canal** [2]. - Its aponeurosis contributes to the **conjoint tendon** and the falx inguinalis. *Internal oblique aponeurosis* - The **internal oblique aponeurosis** is part of the anterior wall and forms the conjoint tendon with the transverse abdominis aponeurosis [2]. - This aponeurosis does not form the superficial inguinal ring; instead, it is found deeper to the external oblique aponeurosis.

Q: Which of the following is NOT a component of the spermatic cord?

Poupart's ligament. ***Poupart's ligament*** - **Poupart's ligament**, also known as the **inguinal ligament**, is a fibrous band extending from the anterior superior iliac spine to the pubic tubercle and forms the **inferior boundary of the inguinal canal**. - It is a boundary structure of the inguinal canal but is **not contained within the spermatic cord** itself [1]. *Genito-femoral nerve* - The **genital branch of the genitofemoral nerve** passes through the inguinal canal and supplies the **cremaster muscle** and scrotal skin [1]. - While it accompanies the spermatic cord through the canal, it is **not traditionally listed as a component of the spermatic cord** in standard anatomical classification, though some sources may include it [1]. *Vas deferens* - The **vas deferens** (ductus deferens) is a thick muscular tube that transports sperm from the epididymis to the ejaculatory duct. - It is a **primary structural component of the spermatic cord** and is the most prominent palpable structure within it. *Pampiniform plexus* - The **pampiniform plexus** is a network of 8-12 veins that surrounds the testicular artery within the spermatic cord. - This venous plexus provides a **countercurrent heat exchange mechanism** for thermoregulation of the testes and is a major component of the spermatic cord.

Q: Which of the following statements about the first part of the duodenum is false?

Supplied by the superior mesenteric artery. ***Supplied by the superior mesenteric artery*** - The first part of the duodenum, derived from the **foregut**, receives its blood supply from the **gastroduodenal artery**, a branch of the celiac artery [1], [2]. - The **superior mesenteric artery** primarily supplies the **midgut** derivatives, which include the distal half of the duodenum and onward [2]. *5 cm long* - The first part of the duodenum is indeed the **shortest** and widest section, typically measuring about **5 cm (2 inches)** in length. - This length allows it to course from the pylorus to the inferior border of the L1 vertebra. *Is superior part* - This statement is correct as the first part courses **superiorly** and then posteriorly, crossing the right crus of the diaphragm. - It lies at the level of the **L1 vertebra**. *Develops from foregut* - The first part of the duodenum, along with the other upper gastrointestinal structures (stomach, liver, pancreas), indeed develops from the **embryonic foregut** [1]. - The transition from foregut to midgut occurs at the level of the **major duodenal papilla**.

Q: Which of the following is not a branch of the splenic artery?

Right Gastroepiploic Artery. ***Right Gastroepiploic Artery*** - This artery originates from the **gastroduodenal artery**, which is a branch of the **common hepatic artery**, not the splenic artery. - It supplies the greater curvature of the stomach and the greater omentum. *Hilar branches of the splenic artery* - These are direct branches of the splenic artery that enter the **hilum of the spleen** [1] to supply the organ itself. - They are essential for the blood supply to the spleen [1]. *Short Gastric Artery* - The **short gastric arteries** arise directly from the splenic artery or its terminal branches [1]. - They supply the fundus and a part of the greater curvature of the stomach [1]. *Arteria Pancreatica Magna* - Also known as the **great pancreatic artery**, this is a significant branch that typically arises from the **splenic artery**. - It supplies the body and tail of the pancreas [1].

Q: Which of the following is not a posterior relation of the right kidney?

11th rib. ***11th rib*** - The right kidney typically extends from the 12th thoracic vertebra to the 3rd lumbar vertebra, usually covered by the **12th rib**. - The **11th rib** is usually a posterior relation of the **left kidney**, due to the lower position of the right kidney compared to the left kidney. *Diaphragm* - The diaphragm lies **posterior** to both the right and left kidneys, separating them from the pleura and lungs. - This anatomical relationship means that renal procedures or severe kidney infections can sometimes affect the thoracic cavity. *Subcostal nerve* - The **subcostal nerve** (T12) runs inferior to the 12th rib and passes **posterior** to both kidneys. - It provides sensory innervation to the skin and motor innervation to abdominal muscles. *Ilioinguinal nerve* - The **ilioinguinal nerve** (L1) emerges from the lumbar plexus and travels **posterior** to the inferior pole of both kidneys [1]. - It primarily provides sensory innervation to the groin and parts of the external genitalia.

Question 1

Which of the following vessels runs through the transverse mesocolon?

Accepted Answer

Middle colic artery

Answer

Right colic artery

Answer

Left colic artery

Answer

Iliocolic artery

Question 2

What is the posterior relation of the neck of the pancreas?

Accepted Answer

Origin of portal vein

Answer

IVC

Answer

Aorta

Answer

Common bile duct

Question 3

Haustrations are present in -

Accepted Answer

Colon

Answer

Duodenum

Answer

Ileum

Answer

Jejunum

Question 4

Floor of Petit triangle is formed by?

Accepted Answer

Internal oblique muscle

Answer

Sacrospinalis muscle

Answer

Rectus abdominis muscle

Answer

Fascia Transversalis layer

Question 5

Ligament which prevents the spleen from falling in left iliac fossa -

Accepted Answer

Phrenicocolic ligament

Answer

Lienorenal ligament

Answer

Upper pole of right kidney

Answer

Sigmoid colon

Question 6

Superficial inguinal ring is a defect in the:

Accepted Answer

External oblique aponeurosis

Answer

Internal oblique muscle

Answer

Transverse abdominis aponeurosis

Answer

Internal oblique aponeurosis

Question 7

Which of the following is NOT a component of the spermatic cord?

Accepted Answer

Poupart's ligament

Answer

Genito-femoral nerve

Answer

Vas deferens

Answer

Pampiniform plexus

Question 8

Which of the following statements about the first part of the duodenum is false?

Accepted Answer

Supplied by the superior mesenteric artery

Answer

5 cm long

Answer

Is superior part

Answer

Develops from foregut

Question 9

Which of the following is not a branch of the splenic artery?

Accepted Answer

Right Gastroepiploic Artery

Answer

Hilar branches of the splenic artery

Answer

Short Gastric Arteries

Answer

Arteria Pancreatica Magna

Question 10

Which of the following is not a posterior relation of the right kidney?

Accepted Answer

11th rib

Answer

Subcostal nerve

Answer

Diaphragm

Answer

Ilioinguinal nerve

Abdomen — MCQs

Abdomen — MCQs

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