Kidneys and Suprarenal Glands — MCQs
The aortic hiatus is formed by the right and left crura of the diaphragm. Which of the following structures does NOT pass through the aortic hiatus?
TRUE statement regarding nerve supply of adrenal gland:
In a patient diagnosed with pheochromocytoma, what is the appropriate preoperative pharmacological management to control hypertension before surgery?
Stab wounds of the kidneys involve other abdominal organs in a high percentage of cases. Of the organs listed, which one is least likely to be damaged in this patient?
Nephron is derived from ?
Which of the following is an end artery?
Which of the following statements about the anatomy of the Fallopian tubes is true?
All of the following nerves are posteriorly related to the kidney, except:
All are lateral branches of the abdominal aorta, EXCEPT which of the following?
Posterior right subhepatic intraperitoneal space is which of the following?
Kidneys and Suprarenal Glands Indian Medical PG Practice Questions and MCQs
Question 1: The aortic hiatus is formed by the right and left crura of the diaphragm. Which of the following structures does NOT pass through the aortic hiatus?
- A. Thoracic duct
- B. Left vagus nerve
- C. Left gastric vein (Correct Answer)
- D. Azygos vein
Explanation: ***Left gastric vein*** - The **left gastric vein** is part of the **portal venous system** and drains into the portal vein. - It **does NOT pass through the diaphragm** via the aortic hiatus or any other diaphragmatic opening. - It has **no anatomical relationship** with the aortic hiatus, making it the best answer to this question. *Thoracic duct* - The **thoracic duct** is the largest lymphatic vessel in the body and **passes through the aortic hiatus** along with the aorta. - It ascends through the aortic hiatus at the **T12 vertebral level** to eventually drain into the left subclavian vein. - It lies posterior to the aorta as it traverses the hiatus. *Left vagus nerve* - The **left vagus nerve** does NOT pass through the aortic hiatus, but it **does pass through the esophageal hiatus** at the T10 level. - It contributes to the **anterior vagal trunk** as it enters the abdomen with the esophagus. - While this structure doesn't pass through the aortic hiatus, it does traverse the diaphragm through a different opening, making it a less definitive answer than the left gastric vein. *Azygos vein* - The **azygos vein** typically **passes through the aortic hiatus** alongside the aorta and thoracic duct. - It may occasionally pass through a separate opening in the right crus of the diaphragm. - It collects deoxygenated blood from the posterior walls of the thorax and abdomen before draining into the superior vena cava.
Question 2: TRUE statement regarding nerve supply of adrenal gland:
- A. Adrenal cortex has no nerve supply
- B. Adrenal medulla has no nerve supply
- C. Release of catecholamines is not affected by nerve supply
- D. Preganglionic fibres from lower thoracic spinal segments bypass sympathetic chain (Correct Answer)
Explanation: ***Preganglionic fibres from lower thoracic & upper lumbar spinal segments bypass sympathetic chain*** - The adrenal medulla is innervated by **preganglionic sympathetic fibers** originating from the **T5-T11 spinal cord segments**, which travel through the splanchnic nerves and synapse directly on chromaffin cells, effectively bypassing the sympathetic chain ganglia [1], [2]. - This direct innervation allows for a **rapid, systemic catecholamine release** in response to stress. *Adrenal cortex has no nerve supply* - The **adrenal cortex** receives some **autonomic innervation**, primarily sympathetic, though it is less dense and its direct role in steroidogenesis is not fully understood. - While hormonal signals are primary for cortical regulation, nerve fibers are present and may modulate blood flow or cellular activity. *Adrenal medulla has no nerve supply* - The **adrenal medulla** is a modified sympathetic ganglion whose **chromaffin cells** are directly innervated by **preganglionic sympathetic fibers** [1], [2]. - This direct neural input is crucial for its rapid response in releasing **catecholamines** into the bloodstream. *Release of catecholamines is not affected by nerve supply* - The release of **catecholamines** (epinephrine and norepinephrine) from the **adrenal medulla** is directly and primarily controlled by **preganglionic sympathetic innervation** [1], [2]. - Without this nerve supply, the stress-induced release of these hormones would be severely impaired, highlighting the critical role of neural input.
Question 3: In a patient diagnosed with pheochromocytoma, what is the appropriate preoperative pharmacological management to control hypertension before surgery?
- A. Phenoxybenzamine and propranolol (Correct Answer)
- B. Propranolol
- C. Nitroglycerine
- D. Phentolamine
Explanation: ***Phenoxybenzamine and propranolol*** - **Phenoxybenzamine** (an **irreversible** non-selective **alpha-blocker**) is initiated first to prevent hypertensive crises during surgery by blocking the effects of catecholamines on blood vessels. - **Propranolol** (a **beta-blocker**) is added after adequate alpha-blockade to control **tachycardia** and arrhythmias, as blocking only alpha-receptors can lead to unopposed beta-adrenergic stimulation. *Phentolamine (short-acting alpha blocker)* - While **phentolamine** is an alpha-blocker, it is typically used for **intraoperative management** of hypertensive crises or for short-term control, not as the primary preoperative preparation. - It is a **reversible** blocker and does not provide the sustained, robust alpha-blockade required for safe preoperative management of pheochromocytoma. *Propranolol (beta-blocker)* - **Beta-blockers** alone should **never be started first** in pheochromocytoma because blocking beta-2 receptors (which mediate vasodilation) in the presence of high circulating catecholamines can lead to **unopposed alpha-adrenergic vasoconstriction**, causing a dangerous hypertensive crisis. - It is only added after adequate alpha-blockade has been achieved to manage **tachycardia**. *Nitroglycerine (vasodilator)* - **Nitroglycerine** is primarily a **venodilator** and is used to relieve angina or manage acute hypertensive emergencies, not for the chronic preoperative management of pheochromocytoma. - It does not address the underlying pathophysiology of excessive catecholamine release and can lead to reflex **tachycardia**.
Question 4: Stab wounds of the kidneys involve other abdominal organs in a high percentage of cases. Of the organs listed, which one is least likely to be damaged in this patient?
- A. Spleen
- B. Stomach (Correct Answer)
- C. Inferior vena cava
- D. Left adrenal gland
Explanation: ***Stomach*** - The **stomach** is located in the **intraperitoneal space**, relatively anteriorly and centrally in the abdomen, while the kidneys are **retroperitoneal** and posteriorly positioned. - Most renal stab wounds occur from a **posterior or posterolateral approach**, making the anteriorly located stomach the **least likely** organ to be injured in conjunction with kidney trauma. - Its high mobility and gas content also offer some degree of protection by allowing it to shift with impact or absorb some of the force without penetrating injury. *Spleen* - The **spleen** is located in the left upper quadrant, in close anatomical proximity to the left kidney, making it highly susceptible to injury in cases of left renal stab wounds. - Its delicate, vascular nature makes it prone to significant bleeding even from minor trauma. *Inferior vena cava* - The **inferior vena cava (IVC)** lies in the retroperitoneum, anterior to the spine and medial to the kidneys, making it vulnerable to deep penetrating wounds that reach the posterior abdominal cavity. - Injury to the IVC can lead to massive hemorrhage and is a life-threatening complication. *Left adrenal gland* - The **left adrenal gland** is located superior and slightly medial to the left kidney, directly in the retroperitoneal space. - A stab wound to the left kidney has a high probability of also involving the closely associated left adrenal gland due to their anatomical proximity.
Question 5: Nephron is derived from ?
- A. Ureteric bud
- B. Mesonephric duct
- C. Metanephros (Correct Answer)
- D. Mesonephros
Explanation: ***Metanephros*** - The **metanephric mesenchyme**, also known as the **metanephros**, gives rise to the excretory units of the kidney, which are the nephrons. - This mesenchymal tissue differentiates to form the **glomerulus**, Bowman's capsule, proximal and distal convoluted tubules, and the loop of Henle. *Ureteric bud* - The **ureteric bud** originates from the mesonephric duct and forms the collecting system of the kidney, including the ureter, renal pelvis, calyces, and collecting ducts. - It induces the differentiation of the metanephric mesenchyme but does not directly form the nephron itself. *Mesonephric duct* - The **mesonephric duct** (Wolffian duct) is a primitive embryonic structure that gives rise to the ureteric bud and parts of the male reproductive system. - It does not directly form any part of the nephron. *Mesonephros* - The **mesonephros** is a transient embryonic kidney that functions briefly during fetal development. - It degenerates and does not contribute to the formation of the definitive nephrons in the mature kidney.
Question 6: Which of the following is an end artery?
- A. Interlobar artery (Correct Answer)
- B. Interlobular artery
- C. Renal artery
- D. Arcuate artery
Explanation: ***Interlobar artery*** - The **interlobar arteries** are true **end arteries** of the kidney with **no anastomoses** between adjacent vessels. - They arise from segmental arteries and run between the renal pyramids toward the corticomedullary junction. - Occlusion of an interlobar artery leads to **segmental infarction** of the kidney tissue it supplies, as there is no collateral circulation. - This is clinically important in cases of renal embolism or thrombosis. *Arcuate artery* - **Arcuate arteries** branch from interlobar arteries and run along the base of the renal pyramids at the corticomedullary junction. - These arteries form **incomplete arches** and have **anastomotic connections** with adjacent arcuate arteries. - Due to these anastomoses, they are **not considered true end arteries**. *Interlobular artery* - **Interlobular arteries** (also called cortical radial arteries) arise from arcuate arteries and extend into the renal cortex. - They give off afferent arterioles to supply glomeruli. - While they have minimal collateral flow, some sources classify them as functional end arteries, but the **interlobar arteries** are the classic example. *Renal artery* - The **renal artery** is the main arterial supply to the kidney and divides into **segmental arteries**. - It is not an end artery as it has multiple large branches that can provide collateral circulation. - The segmental branches further divide into interlobar arteries, which are the actual end arteries.
Question 7: Which of the following statements about the anatomy of the Fallopian tubes is true?
- A. Length is 20 cm
- B. All of the options
- C. Medial to lateral structures are isthmus, interstitial part, ampulla & fimbriae
- D. Lateral to medial structures are fimbriae, ampulla, isthmus, interstitial part (Correct Answer)
Explanation: ***Lateral to medial structures are fimbriae, ampulla, isthmus, interstitial part*** - The Fallopian tube segments, from the **ovary** towards the **uterus**, logically follow this order to facilitate **egg transport**. - The **fimbriae** capture the egg, the **ampulla** is the site of fertilization, the **isthmus** is a narrow segment, and the **interstitial part** traverses the uterine wall [1]. *Length is 20 cm* - The typical length of the **Fallopian tube** is approximately **10-12 cm**, not 20 cm [1]. - A length of 20 cm would be significantly longer than the average human Fallopian tube. *Medial to lateral structures are isthmus, interstitial part, ampulla & fimbriae* - This order is incorrect as it describes the segments from the **uterus** towards the **ovary** but places the **isthmus** before the **interstitial part**. - The correct order from medial to lateral (uterus to ovary) would be **interstitial part**, **isthmus**, **ampulla**, and **infundibulum/fimbriae** [1]. *All of the options* - Since two of the other options contain factual inaccuracies regarding the length and the medial-to-lateral structural arrangement, this option cannot be correct. - Only one statement can be entirely true when specifically asked for the "true" statement among given choices.
Question 8: 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 9: 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 10: Posterior right subhepatic intraperitoneal space is which of the following?
- A. Right paracolic gutter
- B. Lesser sac
- C. Morrison's pouch (Correct Answer)
- D. Superior part of supracolic compartment
Explanation: ***Morrison's pouch*** - This space is officially known as the **hepatorenal recess**, which lies posterior to the **right lobe of the liver** and anterior to the **right kidney and adrenal gland**. - It's a common site for **fluid accumulation** (e.g., blood, ascites) in the supine patient due to gravity. [1] *Lesser sac* - The lesser sac, or **omental bursa**, is located posterior to the **stomach** and is generally superior and to the left of the region described. - It communicates with the greater sac via the **epiploic foramen (foramen of Winslow)**. *Right paracolic gutter* - The right paracolic gutter is a **longitudinal peritoneal recess** lateral to the **ascending colon**, extending inferiorly toward the pelvis. [1] - It facilitates the flow of **peritoneal fluid** from the supracolic compartment to the infracolic compartment and pelvic cavity. *Superior part of supracolic compartment* - The supracolic compartment encompasses the area above the **transverse mesocolon**, including spaces around the **liver, spleen, and stomach**. [1] - Morrison's pouch, however, is located in the **right subhepatic space** and extends into the **infracolic compartment** (below the transverse mesocolon), not within the supracolic compartment itself. - This option is too broad and anatomically distinct from the specific posterior right subhepatic space described in the question.
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