Which of the following is a retroperitoneal structure?

AIIMS BHOPAL NO- 2018( Shift-2nd)

Applied Anatomy

Easy

Appeared in: AIIMS BHOPAL NO- 2018( Shift-2nd)

Explanation

The kidneys are primary retroperitoneal organs, meaning they are located behind the parietal peritoneum.
They are situated on the posterior abdominal wall, one on each side of the vertebral column.
This anatomical position is consistent throughout development and adult life, making the kidney a definitive example of a retroperitoneal structure.
Source SRC_15139 explicitly places the kidneys in the posterior retroperitoneal space.

Option A: The stomach is an intraperitoneal organ, meaning it is suspended within the peritoneal cavity and almost completely covered by peritoneum.
Option B: While most of the pancreas (head, neck, and body) is retroperitoneal, its tail is intraperitoneal. This makes it a 'secondarily' retroperitoneal organ and a less precise answer than the kidney, which is entirely retroperitoneal.
Option D: The spleen is an intraperitoneal organ, located within the peritoneal cavity.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomical location of abdominal organs relative to the peritoneum (retroperitoneal vs. intraperitoneal) as background academic context rather than a clinical decision trigger.
Understanding the retroperitoneal location of the kidneys is crucial for physical assessment. Inflammation or infection (pyelonephritis) typically causes pain in the flank (back and side), not the anterior abdomen. Nurses assess this by percussing for Costovertebral Angle (CVA) tenderness.
Surgical procedures on the kidneys or adrenal glands often utilize a posterior or flank incision to access the organ directly without entering the peritoneal cavity, which reduces the risk of peritonitis (infection of the peritoneum).
Trauma to the back or flank can cause a retroperitoneal hemorrhage from an injured kidney, which may not be immediately obvious with signs of abdominal rigidity that are typical for intraperitoneal bleeding.

How to Approach the Question

First, identify the core concept of the question, which is to identify a 'retroperitoneal' structure.
Define 'retroperitoneal' in your mind: an organ located behind the peritoneum, the membrane lining the abdominal cavity.
Recall the major abdominal organs and their classification. Using a mnemonic like 'SAD PUCKER' can be extremely helpful for remembering the retroperitoneal organs.
Systematically evaluate each option against your definition: Stomach (intraperitoneal), Pancreas (mostly retroperitoneal), Kidney (retroperitoneal), Spleen (intraperitoneal).
Notice that both the pancreas and kidney are listed as retroperitoneal. At this point, you must select the best answer. The kidney is a primary retroperitoneal organ (always behind the peritoneum), while the pancreas is secondarily retroperitoneal (it moves there during development) and its tail is still intraperitoneal. Therefore, the kidney is the most complete and accurate answer.

Concept Tested & Keywords

Concept Tested: Anatomical location of abdominal organs relative to the peritoneum (retroperitoneal vs. intraperitoneal).
Stem keywords: retroperitoneal structure
Lead-in keywords: Which of the following is

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