Head and neck: C1 fibres in the strap muscles: 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 · Head and neck: C1 fibres in the strap muscles

Sample item

A surgeon dissecting the anterior triangle sees C1 fibres running with the hypoglossal nerve. Which infrahyoid muscle receives its supply directly from these fibres rather than from the ansa cervicalis?

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

The answer and the reasoning

A. Thyrohyoid

C1 fibres join the hypoglossal nerve and then leave it as the nerve to thyrohyoid (and to geniohyoid), while the superior root of the ansa cervicalis, also from C1, descends to join the inferior root (C2, C3) to supply sternohyoid, sternothyroid and omohyoid.

Option by option

  • A. Thyrohyoid (correct)

    Correct. Thyrohyoid is supplied directly by a C1 branch carried with the hypoglossal nerve.

  • B. Omohyoid

    Omohyoid is supplied through the ansa cervicalis.

  • C. Sternothyroid

    Sternothyroid is supplied through the ansa cervicalis.

  • D. Sternohyoid

    Sternohyoid is supplied through the ansa cervicalis.

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 A, Thyrohyoid. C1 fibres join the hypoglossal nerve and then leave it as the nerve to thyrohyoid (and to geniohyoid), while the superior root of the ansa cervicalis, also from C1, descends to join the inferior root (C2, C3) to supply sternohyoid, sternothyroid and omohyoid.

Why is "Omohyoid" not the answer?

Omohyoid is supplied through the ansa cervicalis.

Why is "Sternothyroid" not the answer?

Sternothyroid is supplied through the ansa cervicalis.

Why is "Sternohyoid" not the answer?

Sternohyoid is supplied through the ansa cervicalis.

What concept does this question test?

It tests Head and neck: C1 fibres in the strap muscles in Anatomy. The correct option holds because: Correct. Thyrohyoid is supplied directly by a C1 branch carried with the hypoglossal nerve.

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 Head and neck: C1 fibres in the strap muscles?

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.