Multiple choice

Which of the following structures belongs to the right atrium in a mammalian heart?

  1. Levator veli palatini

  2. Tendinous cords

  3. Orifice of the coronary sinus

  4. Trabeculae carneae

  5. Aortic orifice
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C Correct answer
Explanation

The coronary sinus is a major coronary vein. It returns the majority of the left ventricular blood flow to the right atrium. The coronary sinus orifice of the right atrium is the aperture via which approximately 90% venous drainage of the heart is returned to the circulation by the coronary sinus.

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