Thorax: right ventricle: 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 · Thorax: right ventricle

Sample item

A surgeon repairing a ventricular septal defect notes a muscular bridge crossing from the interventricular septum to the base of the anterior papillary muscle of the right ventricle. What does this bridge chiefly convey?

AThe right limb of the atrioventricular bundleBThe great cardiac veinCThe sinoatrial node arteryDThe left limb of the atrioventricular bundle

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

The answer and the reasoning

A. The right limb of the atrioventricular bundle

The septomarginal trabecula (moderator band) carries the right bundle branch to the anterior papillary muscle, so the right ventricle contracts in a coordinated way. Damage to it during septal surgery can cause right bundle branch block. The left bundle branch runs on the left side of the septum.

Option by option

A. The right limb of the atrioventricular bundle (correct)
Correct. The moderator band carries the right bundle branch to the anterior papillary muscle.
B. The great cardiac vein
The great cardiac vein lies in the anterior interventricular groove outside the ventricular cavity.
C. The sinoatrial node artery
The sinoatrial nodal artery lies in the right atrium near the superior vena cava.
D. The left limb of the atrioventricular bundle
The left bundle branch runs on the left side of the septum, not in the right ventricular cavity.

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.

Questions about this Anatomy question

What is the answer to this Anatomy question?

The best answer is A, The right limb of the atrioventricular bundle. The septomarginal trabecula (moderator band) carries the right bundle branch to the anterior papillary muscle, so the right ventricle contracts in a coordinated way.

Why is "The great cardiac vein" not the answer?

The great cardiac vein lies in the anterior interventricular groove outside the ventricular cavity.

Why is "The sinoatrial node artery" not the answer?

The sinoatrial nodal artery lies in the right atrium near the superior vena cava.

Why is "The left limb of the atrioventricular bundle" not the answer?

The left bundle branch runs on the left side of the septum, not in the right ventricular cavity.

What concept does this question test?

It tests Thorax: right ventricle in Anatomy. Damage to it during septal surgery can cause right bundle branch block. The left bundle branch runs on the left side of the septum.

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 Thorax: right ventricle?

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.