Larynx: Semon's law: practice question

A ENT 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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ENT · Larynx: Semon's law

Sample item

In a slowly progressive lesion of the recurrent laryngeal nerve, which fibres are affected first according to Semon's law?

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

The answer and the reasoning

A. Abductor fibres to the posterior cricoarytenoid

Semon's law states that in progressive organic lesions the abductor fibres are more vulnerable and lost first, leaving the cord in the median or paramedian position, while adductor loss follows later. This is why bilateral lesions cause stridor early.

Option by option

  • A. Abductor fibres to the posterior cricoarytenoid (correct)

    Correct. Abductor fibres are affected first.

  • B. Tensor fibres

    Tensor fibres belong to the external laryngeal nerve.

  • C. Sensory fibres

    Sensory fibres are not the basis of the law.

  • D. Adductor fibres

    Adductor fibres are lost later.

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 ENT question

What is the answer to this ENT question?

The best answer is A, Abductor fibres to the posterior cricoarytenoid. Semon's law states that in progressive organic lesions the abductor fibres are more vulnerable and lost first, leaving the cord in the median or paramedian position, while adductor loss follows later.

Why is "Tensor fibres" not the answer?

Tensor fibres belong to the external laryngeal nerve.

Why is "Sensory fibres" not the answer?

Sensory fibres are not the basis of the law.

Why is "Adductor fibres" not the answer?

Adductor fibres are lost later.

What concept does this question test?

It tests Larynx: Semon's law in ENT. This is why bilateral lesions cause stridor early.

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 Larynx: Semon's law?

Learn tuning fork results and audiogram patterns by sketching them. Then use the flashcards and the other ENT 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.