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12 Cards in this Set
- Front
- Back
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What do blood islands form?
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Blood cells (center of mass), endothelium (peripheral cells of mass), serum/plasma (secreted by center cells of mass).
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After hematoposesis in blood island ceases in the embryo, where does it occur?
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In liver, bone marrow, spleen and thymus.
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What region do the vitelline vessels supply?
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The yolk sac.
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Where does the endocardial tube come from?
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Lateral plate mesoderm.
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What 3 layers form from this precardiac mesoderm - in order from outside in?
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Epicardium, myocardium, endocardium.
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Which of the three layers is the endothelium of the heart?
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Endocardium.
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As the heart (endocardial) tube invaginates the pericardial sac into the percardium, there are 5 dilations from the arterial end to the venous end. List them in order from arterial to venous.
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Truncus arteriosus, bulbis cordis, primitive ventricle, primitive atrium, sinus venosus.
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What does each of these dilated regions eventually form?
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Truncus arteriosus: aorta and pulmonary trunk. Bulbis cordis: smooth part of the right and left ventricles. Primitive ventricle: trabeculated portions of the right and left ventricles. Primitive atrium: auricles and part of the right atrium with pectinate mm. Sinus venosus: smooth part of the right atrium, coronary sinus and oblique vein.
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Why does the heart tube fold?
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The lower regions grow faster than the upper regions and both ends are anchored by the pericardiac sac so its growth causes folding within the sac.
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What do the endocardial cushions become?
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The cushions fuse to form the septum intermedium which divides the atrio-ventricular canal into right and left halves.
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What does the septum intermedium fuse with?
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The septum primum growing down from above.
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What foramen forms in the fused septa? What does it allow?
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The septum secundum. Allows oxygenated blood from maternal placenta to bypass the lungs by flowing from the right atrium into the left atrium.
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