connectdrmilind
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D. Sinus venosus
[code]http://books.google.co.in/books?id=dzkn9vYYpBYC&pg=PA32&dq=smooth+part+of+the+right+atrium&as_brr=3&cd=5#v=onepage&q=smooth%2[code]
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| Venus6
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The correct answer is D. 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.
The truncus arteriosus (choice E) gives rise to the proximal part of the aorta and the
proximal part of the pulmonary artery.
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