Question at position 52 Which vein runs with the right marginal artery?Great cardiac veinCoronary sinusSmall cardiac veinMiddle cardiac vein

Question

BlackTom AI · Accepted Answer

The right marginal artery (also called the acute marginal branch of the right coronary artery) courses along the acute (right) margin of the heart supplying the right ventricle; its venous companion is the small cardiac vein.

1. Relevant knowledge points and concepts
- Coronary arteries and veins generally run in paired patterns: an artery supplying a region is accompanied by a similarly placed cardiac vein that drains that region.
- The right marginal (acute marginal) artery branches from the right coronary artery and runs along the inferior (acute) margin of the heart toward the apex, supplying the right ventricle.
- The small cardiac vein runs in the right atrioventricular (coronary) sulcus and along the right margin of the heart, draining the right atrium and ventricle into the coronary sinus.

2. Step-by-step reasoning
- Identify the territory of the right marginal artery: right ventricular free wall along the right border of the heart.
- Identify which vein drains that territory: the small cardiac vein follows the right border and collects venous return from the same area.
- Therefore the small cardiac vein runs with (is the venous companion of) the right marginal artery.

3. Calculations/intermediate steps
- No numeric calculations are needed; intermediate anatomical mapping:
  - Right marginal artery → right border (supplies RV)
  - Small cardiac vein → right border (drains RV) → empties into coronary sinus
  - Hence artery–vein pairing: right marginal artery ↔ small cardiac vein

4. Why the correct answer is correct
- The small cardiac vein is anatomically situated in the right atrioventricular groove and along the right margin, directly accompanying the right marginal artery and draining the same region into the coronary sinus.

5. Why the other options are incorrect
- Great cardiac vein: accompanies the anterior interventricular (left anterior descending) artery and then the circumflex—drains the anterior left heart, not the right margin.
- Coronary sinus: is the large venous channel that receives most cardiac veins; it is not the vein that runs along the right marginal artery (it receives the small cardiac vein).
- Middle cardiac vein: runs in the posterior interventricular sulcus with the posterior interventricular (descending) artery, draining the posterior septum, not the right margin.

6. Conclusion
This confirms the correct answer is Small cardiac vein, matching the provided answer.

Question at position 52 Which vein runs with the right marginal artery?Great cardiac veinCoronary sinusSmall cardiac veinMiddle cardiac vein单项选择题

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