Pelvis: pudendal nerve: practice question

A Anatomy question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Anatomy · Pelvis: pudendal nerve

Sample item

Which spinal nerve roots form the pudendal nerve that supplies the external anal sphincter?

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

The answer and the reasoning

D. S2-S4

The pudendal nerve arises from anterior rami S2-S4, exits via the greater sciatic foramen, and re-enters through the lesser sciatic foramen to travel in Alcock canal.

Option by option

  • A. L1-L2

    L1-L2 contributes to the ilioinguinal and genitofemoral nerves.

  • B. S1-S2

    S1-S2 alone is incomplete for pudendal origin.

  • C. L4-L5

    L4-L5 contributes to lumbosacral plexus branches but not pudendal nerve.

  • D. S2-S4 (correct)

    Correct. S2-S4 innervates the pelvic floor and external sphincters.

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.

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Questions about this Anatomy question

What is the answer to this Anatomy question?

The best answer is D, S2-S4. The pudendal nerve arises from anterior rami S2-S4, exits via the greater sciatic foramen, and re-enters through the lesser sciatic foramen to travel in Alcock canal.

Why is "L1-L2" not the answer?

L1-L2 contributes to the ilioinguinal and genitofemoral nerves.

Why is "S1-S2" not the answer?

S1-S2 alone is incomplete for pudendal origin.

Why is "L4-L5" not the answer?

L4-L5 contributes to lumbosacral plexus branches but not pudendal nerve.

What concept does this question test?

It tests Pelvis: pudendal nerve in Anatomy. The correct option holds because: Correct. S2-S4 innervates the pelvic floor and external sphincters.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. 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 Pelvis: pudendal nerve?

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.