Anatomy Gross Anatomy of the Kidney Questions and Answers — Questions and Answers
Question 1: Which of the following represents the correct sequence for the flow of urine after it is produced in the nephrons?
- Major calyx -> Minor calyx -> Renal papilla -> Renal pelvis
- Renal pelvis -> Minor calyx -> Major calyx -> Renal papilla
- Renal papilla -> Minor calyx -> Major calyx -> Renal pelvis (Correct answer)
- Renal cortex -> Renal medulla -> Major calyx -> Renal pelvis
Correct answer: Renal papilla -> Minor calyx -> Major calyx -> Renal pelvis
Urine produced in the nephrons drains through collecting ducts to the renal papilla, the apex of a renal pyramid. From there, it enters a minor calyx. Several minor calyces unite to form a major calyx, and the major calyces converge to form the renal pelvis, which is the funnel-like structure that narrows to become the ureter.
Question 2: During a nephrectomy, a surgeon must carefully ligate the vessels and structures at the renal hilum. What is the typical anatomical arrangement of these main structures from anterior to posterior?
- Renal Vein, Renal Artery, Renal Pelvis (Correct answer)
- Renal Artery, Renal Vein, Renal Pelvis
- Renal Pelvis, Renal Artery, Renal Vein
- Renal Artery, Renal Pelvis, Renal Vein
Correct answer: Renal Vein, Renal Artery, Renal Pelvis
The standard anatomical arrangement of the major structures at the renal hilum from anterior (front) to posterior (back) is: Renal Vein, Renal Artery, and Renal Pelvis/Ureter. This relationship is often remembered by the mnemonic 'VAP' (Vein, Artery, Pelvis).
Question 3: A patient suffers a deep laceration to their back, directly over the kidney. Which of the following is the innermost, tough, fibrous layer that directly adheres to the kidney's surface and would be the last layer to be pierced before reaching the renal parenchyma?
- Renal fascia (Gerota's fascia)
- Perinephric fat (Perirenal fat)
- Paranephric fat (Pararenal fat)
- Renal capsule (Correct answer)
Correct answer: Renal capsule
The renal capsule is a dense, fibrous layer that is firmly attached to the outer surface of the kidney. It serves as a barrier against trauma and the spread of infection. The layers from deep (innermost) to superficial (outermost) are: Renal capsule, Perinephric fat, Renal fascia, and Paranephric fat.
Question 4: The arcuate arteries are significant vascular landmarks within the kidney. They are found arching over the renal pyramids at the junction between which two distinct regions?
- Renal pelvis and the major calyces
- Renal cortex and renal medulla (Correct answer)
- Renal pyramids and the renal papillae
- Fibrous capsule and the renal cortex
Correct answer: Renal cortex and renal medulla
The arcuate arteries are named for their arch-like course as they run along the boundary between the outer renal cortex and the inner renal medulla. They branch from the interlobar arteries and give rise to the cortical radiate (interlobular) arteries that supply the cortex.
Question 5: A pathology report describes a small, well-encapsulated tumor located at the superomedial aspect of the left kidney. This tumor is most likely compressing which adjacent structure?
- Left adrenal (suprarenal) gland (Correct answer)
- Spleen
- Tail of the pancreas
- Descending colon
Correct answer: Left adrenal (suprarenal) gland
The adrenal (or suprarenal) glands are situated on the superior and medial aspect of each kidney. A tumor at the superomedial pole of the left kidney would directly impinge upon the left adrenal gland. While the spleen, pancreas, and colon have anatomical relationships to the left kidney, they are not located at its immediate superomedial pole.
Question 6: Which of the following structures are best described as inward extensions of cortical tissue that separate the renal pyramids within the medulla?
- Renal papillae
- Major calyces
- Renal columns of Bertin (Correct answer)
- Medullary rays
Correct answer: Renal columns of Bertin
The renal columns (of Bertin) are extensions of the renal cortex that project down into the medulla, located in the spaces between the renal pyramids. They are composed of the same tissue as the cortex and provide a supportive framework and a route for blood vessels.
Anatomy Gross Anatomy of the Kidney Questions and Answers
Which of the following represents the correct sequence for the flow of urine after it is produced in the nephrons?