new_n_lost
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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
E. Truncus arteriosus
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| ellen
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D
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| po
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ok,me review.
Primitive heart tube -has 5 dilatations.
1.truncus arteriosus-gives aorta and pulmonary trunk
2.bulbus cordis-smooth parts of rt & left ventricles
3.primitive ventricle-trabeculated parts of rt &left ventrcles.
4.primitive atrium- gives trbeculated parts of rt & left atria.
5.sinus venosus-
smooth part of rt atrium
coronary sinus
oblique vein of left atrium
Note-
smooth part of left atrium formed by incorporation of parts of pulmonary veins
crista terminalis is junction of smooth and trabeculated parts of rt atrium.
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| forumdoctor
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D
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| new_n_lost
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| new_n_lost
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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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| new_n_lost
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 Damn Good Job PO
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| ieltsforall
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YES D
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