The smooth part of the right atrium derives from which of the following embryonic structures?
a. Bulbus cordis
b. Primitive atrium
c. Primitive ventricle
d. Sinus venosus
The Correct option is D
Explanation with High Yield Facts:
The smooth part of the right atrium (the sinus venarum) is derived from the sinus venosus. The coronary sinus and the oblique vein of the left atrium also derive from the sinus venosus. The bulbus cordis (choice A) gives rise to the smooth part of the right ventricle (conus arteriosus) and the smooth part of the left ventricle (aortic vestibule). The primitive atrium (choice B) gives rise to the trabeculated part of the right and left atria.The primitive ventricle (choice C) gives rise to the trabeculated part of the right and left ventricles.
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