10 Questions
What is the origin of the vascular system (heart and blood vessels)?
Mesodermal
What do the angioblasts (vascular mesodermal cells) form during development?
Blood islands
Where do the blood islands form in the embryonic disc?
In the cardiogenic area
What do the blood islands in the rest of the embryonic regions form?
Primitive blood vessels
What do the clusters of cells called blood islands form in the cardiogenic area of the embryonic disc?
Endocardial heart tubes
What results from the unequal growth of the heart tube?
Formation of 4 dilated sacs separated by narrow constrictions
What is the arrangement of the dilated sacs resulting from the differentiation of the heart tube?
Bulbus cordis, primitive ventricle, primitive atrium, sinus venosus
What derivatives does the sinus venosus give rise to?
Smooth posterior part of coronary sinus, lower part of the superior oblique vein, degenerated umbilical vein
What results from the rapid growth of the heart tube compared to the cranial pericardium?
Formation of an S-shaped loop due to dorsal folding of the heart tube
What is the result of the development of interatrial septum?
Division of the common atrium into right and left atria
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