Abdomen Practice Questions

Q: Which organ is primarily supplied by the portal vein?

Liver. ***Liver*** - The **portal vein** is unique in that it carries **nutrient-rich, deoxygenated blood** from the gastrointestinal tract and spleen directly to the liver [1], [2]. - This specialized circulation allows the liver to **process absorbed nutrients** and detoxify harmful substances before they enter the systemic circulation [1], [3]. *Spleen* - The spleen is supplied by the **splenic artery**, a branch of the **celiac trunk**, which carries oxygenated arterial blood to the organ. - While the splenic vein drains into the portal vein, the portal vein itself does not primarily supply the spleen [2]. *Pancreas* - The pancreas receives its blood supply from branches of the **celiac artery** and the **superior mesenteric artery**, specifically the splenic, gastroduodenal, and superior mesenteric arteries [1]. - While pancreatic veins drain into the portal system, the portal vein is not the primary arterial supply to the pancreas [1]. *Colon* - The colon is supplied by the **superior mesenteric artery** and the **inferior mesenteric artery**, which provide oxygenated arterial blood to different segments of the large intestine. - The venous drainage from the colon primarily collects into the superior and inferior mesenteric veins, which then merge to form part of the portal venous system, but the portal vein does not primarily supply the colon with blood [2].

Q: Which segment of the liver is the caudate lobe classified as in the Couinaud classification?

Segment I. Segment I - In the **Couinaud classification system**, the liver is divided into eight functionally independent segments [1]. - The **caudate lobe**, which has its own independent blood supply and venous drainage, is designated as **Segment I** [1]. *Segment II* - This segment is part of the **left lateral section** of the liver, located superiorly [2]. - It is distinct from the caudate lobe and primarily associated with the **left hepatic vein** drainage. *Segment III* - This segment is also part of the **left lateral section** of the liver, located inferiorly [2]. - It drains into the **left hepatic vein** and is separate from the caudate lobe's unique anatomical position. *Segment IV* - Also known as the **quadrate lobe**, this segment is part of the **left medial section** of the liver [2]. - It is located anteriorly, distinguishing it from the posteriorly located caudate lobe (**Segment I**) [1].

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

Segments II & III. ***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.

Q: Which of the following is NOT an anterior relation of the right kidney?

4th part of duodenum. ***4th part of duodenum*** - The **4th part of the duodenum** is located to the **left of the vertebral column** and is related to the **left kidney**, not the right kidney. - This segment passes superiorly along the left side of the aorta to become continuous with the jejunum at the duodenojejunal flexure. *Liver* - The **right kidney's superior part** is in direct contact with the **right lobe of the liver**, often separated only by the peritoneum [1]. - This is a significant anterior relation, explaining why liver enlargement can sometimes displace the right kidney. *Hepatic flexure* - The **hepatic flexure** (right colic flexure) of the colon lies immediately inferior to the liver and anterior to the **lower part of the right kidney**. - This anatomical relationship means that the right kidney can be affected by diseases of the colon in this region. *2nd part of duodenum* - The **descending (2nd) part of the duodenum** lies anterior to the **hilum and medial part of the right kidney** [1]. - Its retroperitoneal position places it in close proximity to the renal structures, making it a key anterior relation.

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

Between internal oblique and transversus abdominis. ***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.

Q: Which is the primary segment of the liver drained by the right hepatic vein?

VII. ***VII*** - The **right hepatic vein** drains the **posterior segment** of the right lobe, which includes segments **VI and VII**. Segment VII is particularly well-drained by this vein. [3] - Understanding hepatic venous drainage is crucial for **surgical planning** and interpreting imaging studies of the liver. [4] *I* - Segment I, the **caudate lobe**, is unique in its venous drainage, often by small veins directly into the **inferior vena cava (IVC)** or occasionally into the left and middle hepatic veins. [1] - It has a separate blood supply and drainage which differentiates it from other segments. [4] *II* - Segment II is part of the **left lateral segment** and is primarily drained by the **left hepatic vein**. - The left hepatic vein typically drains segments II and III. [2] *IV* - Segment IV, or the **quadrate lobe**, is primarily drained by the **middle hepatic vein**. - The middle hepatic vein also drains segment VIII and the anterior aspect of segment V.

Q: Right ovarian artery is a branch of ?

Abdominal aorta. ***Abdominal aorta*** - The **right ovarian artery** typically originates directly from the **abdominal aorta**, just inferior to the renal arteries [1]. - This is a direct branch, supplying blood to the **right ovary**, **fallopian tube**, and surrounding structures [1]. *Right internal iliac* - The **internal iliac artery** primarily supplies the **pelvic organs**, gluteal region, and medial thigh [1]. - While it has branches to pelvic structures, the ovarian artery does not originate from it. *Common iliac* - The **common iliac artery** bifurcates into the **internal and external iliac arteries** at the level of the sacroiliac joint. - It does not directly give off the ovarian artery. *External iliac* - The **external iliac artery** continues as the **femoral artery** below the inguinal ligament, primarily supplying the lower limb. - It does not give off branches to the ovary.

Q: All of the following arteries are branches of the coeliac trunk, EXCEPT which one?

Right gastric artery. ***Right gastric artery*** - The **right gastric artery** typically originates from the **proper hepatic artery**, which is a branch of the common hepatic artery. - Therefore, it is not a direct branch of the coeliac trunk itself. *Left gastric artery* - The **left gastric artery** is one of the three main direct branches of the **coeliac trunk**. - It supplies the lesser curvature of the stomach and the abdominal esophagus. *Splenic artery* - The **splenic artery** is another major direct branch of the **coeliac trunk**. - It supplies the spleen, pancreas, and parts of the stomach via various branches. *Common hepatic artery* - The **common hepatic artery** is the third main direct branch of the **coeliac trunk**. - It gives rise to the proper hepatic artery and the gastroduodenal artery, supplying the liver, gallbladder, pylorus, and duodenum.

Q: From which ribs does the spleen extend?

9th to 11th rib. ***9th to 11th rib*** - The **spleen** is located in the **left upper quadrant** of the abdomen, deep to the 9th, 10th, and 11th ribs. - Its protected position beneath these ribs makes it vulnerable to injury from trauma to the left lower chest or upper abdomen. *5th to 9th rib* - This range primarily covers the location of the **heart** and the upper part of the **lungs**. - While the spleen is superior to other abdominal organs, it does not extend as high as the 5th rib. *2nd to 5th rib* - This region is mainly associated with the **upper lobes of the lungs** and the **superior mediastinum**. - The spleen is an abdominal organ and is situated much lower in the thoracic cavity. *11th to 12th rib* - This range is too low and posterior for the typical position of the spleen, especially for its superior border. - The 12th rib primarily overlies the **kidneys** and the more inferior aspects of the diaphragm.

Q: Which structure is not seen at the L3 level?

Coeliac trunk. ***Coeliac trunk*** - The **coeliac trunk** typically arises from the abdominal **aorta** at the level of **T12-L1**, which is significantly higher than L3. - It then immediately branches into the **left gastric**, **splenic**, and **common hepatic arteries** to supply foregut structures. *Iliac vessels* - The **common iliac arteries** and veins typically bifurcate from the **aorta** and **IVC** around the L4-L5 level. - Their presence, or the start of their formation, can be observed near or just above **L3**, depending on individual anatomical variation and how "at the L3 level" is interpreted (e.g., within the L3 vertebral body's span). *Aorta* - The **abdominal aorta** descends along the posterior abdominal wall and is a prominent structure at the **L3 level**. - It typically bifurcates into the common iliac arteries at the level of **L4**, meaning it is still a large, undivided vessel at L3. *IVC* - The **inferior vena cava (IVC)** ascends through the abdomen and is a significant vascular structure at the **L3 level**. - It is formed by the union of the common iliac veins at the level of **L5** and continues superiorly.

Question 1

Which organ is primarily supplied by the portal vein?

Accepted Answer

Liver

Answer

Spleen

Answer

Pancreas

Answer

Colon

Question 2

Which segment of the liver is the caudate lobe classified as in the Couinaud classification?

Accepted Answer

Segment I

Answer

Segment II

Answer

Segment III

Answer

Segment IV

Question 3

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

Accepted Answer

Segments II & III

Answer

Segments I & IV

Answer

Segments V & VI

Answer

Segments VII & VIII

Question 4

Which of the following is NOT an anterior relation of the right kidney?

Accepted Answer

4th part of duodenum

Answer

Hepatic flexure

Answer

Liver

Answer

2nd part of duodenum

Question 5

Where is the neurovascular plane located in the anterior abdominal wall?

Accepted Answer

Between internal oblique and transversus abdominis

Answer

Between external oblique and internal oblique

Answer

Below transversus abdominis

Answer

Above external oblique

Question 6

Which is the primary segment of the liver drained by the right hepatic vein?

Accepted Answer

VII

Answer

I

Answer

II

Answer

IV

Question 7

Right ovarian artery is a branch of ?

Accepted Answer

Abdominal aorta

Answer

Right internal iliac

Answer

Common iliac

Answer

External iliac

Question 8

All of the following arteries are branches of the coeliac trunk, EXCEPT which one?

Accepted Answer

Right gastric artery

Answer

Splenic artery

Answer

Left gastric artery

Answer

Common hepatic artery

Question 9

From which ribs does the spleen extend?

Accepted Answer

9th to 11th rib

Answer

5th to 9th rib

Answer

2nd to 5th rib

Answer

11th to 12th rib

Question 10

Which structure is not seen at the L3 level?

Accepted Answer

Coeliac trunk

Answer

Iliac vessels

Answer

Aorta

Answer

IVC

Abdomen — MCQs

Abdomen — MCQs

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