How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Embryology: urinary system?

Learn every nerve by its route, its muscles and what a lesion looks like at the bedside. That one habit answers a large share of questions. Then use the flashcards and the other Anatomy questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.

Embryology: urinary system MCQ (B11-ANAT3-35)

Q: What is the answer to this Anatomy question?

The best answer is C, Defective mesonephric duct, which gives rise to both the ureteric bud and the vas deferens. The ureteric bud arises from the mesonephric duct and induces the metanephric blastema to form the kidney.

Q: What concept does this question test?

It tests Embryology: urinary system in Anatomy. The mesonephric duct also gives rise to the vas deferens, epididymis, seminal vesicle and ejaculatory duct in males. Failure of the duct therefore causes renal agenesis together with absence of the vas deferens.

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Anatomy · Embryology: urinary system

Sample item

A boy has unilateral renal agenesis on ultrasound and is later found to lack the ipsilateral vas deferens. What explains this association?

ADefective paramesonephric duct, which gives rise to both the ureteric bud and the vas deferensBDefective metanephric blastema, which gives rise to both the nephrons and the vas deferensCDefective mesonephric duct, which gives rise to both the ureteric bud and the vas deferensDDefective urogenital sinus, which gives rise to both the ureter and the vas deferens

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

C. Defective mesonephric duct, which gives rise to both the ureteric bud and the vas deferens

The ureteric bud arises from the mesonephric duct and induces the metanephric blastema to form the kidney. The mesonephric duct also gives rise to the vas deferens, epididymis, seminal vesicle and ejaculatory duct in males. Failure of the duct therefore causes renal agenesis together with absence of the vas deferens.

Option by option

A. Defective paramesonephric duct, which gives rise to both the ureteric bud and the vas deferens
The paramesonephric duct regresses in males and does not form the ureteric bud.
B. Defective metanephric blastema, which gives rise to both the nephrons and the vas deferens
The blastema forms nephrons but not the vas deferens, which is a duct derivative.
C. Defective mesonephric duct, which gives rise to both the ureteric bud and the vas deferens (correct)
Correct. The mesonephric duct gives rise to both the ureteric bud and the vas deferens.
D. Defective urogenital sinus, which gives rise to both the ureter and the vas deferens
The urogenital sinus forms the bladder and urethra, not the vas deferens or ureteric bud.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Embryology: urinary system: practice question

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The answer and the reasoning

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