Podcast
Questions and Answers
What is the embryonic origin of the sinus venosus?
What is the embryonic origin of the sinus venosus?
On what day does the fusion of the two heart tubes into a single endocardial tube occur?
On what day does the fusion of the two heart tubes into a single endocardial tube occur?
Which structure does the primitive atrium divide into?
Which structure does the primitive atrium divide into?
What does the primitive ventricle originate superior to?
What does the primitive ventricle originate superior to?
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Which vein does the sinus venosus form?
Which vein does the sinus venosus form?
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What is the endocardium's relation to the myocardium?
What is the endocardium's relation to the myocardium?
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True or False. Sinus Venosus are formed by the union of 3 veins, Common or cardinal, Vitelline, and umbilical
True or False. Sinus Venosus are formed by the union of 3 veins, Common or cardinal, Vitelline, and umbilical
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The Primitive Atrium
The Primitive Atrium
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Atrioventricular Sulcus: divides primitive atrium and primitive
Atrioventricular Sulcus: divides primitive atrium and primitive
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This will give rise to trabecular expansion with inferior growth that will form the apical portion of the left ventricle
This will give rise to trabecular expansion with inferior growth that will form the apical portion of the left ventricle
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this will also contribute to the inlet portion of the right ventricle
this will also contribute to the inlet portion of the right ventricle
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What divides the primitive ventricle and the bulbus cordis
What divides the primitive ventricle and the bulbus cordis
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The bulbus Cordis can be divided into three separate parts
The bulbus Cordis can be divided into three separate parts
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the proximal bulbus cordis will give rise to a trabecular expansion with inferior growth that will form part of the right ventricle
the proximal bulbus cordis will give rise to a trabecular expansion with inferior growth that will form part of the right ventricle
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this connects the primitive right ventricle with the truncus arteriosus
this connects the primitive right ventricle with the truncus arteriosus
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this will form the aorta and the main pulmonary artery
this will form the aorta and the main pulmonary artery
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Aortic sac will rise to form the five pairs of the aortic arches.
Aortic sac will rise to form the five pairs of the aortic arches.
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Study Notes
- Prior to week 3 of embryonic development, the heart consists of two tubes on the midline of the embryo.
- The inner thinner layer is called the endocardium, and the outer thicker layer is called the myocardium.
- Around day 21-23, these two tubes are forced to the midline and fused into a single endocardial tube.
- This single tube connects to the developing aortic arch system at the cephalic end and the sinus venosus at the caudal end.
- The sinus venosus is formed by the union of three veins: common/cardinal, vitelline, and umbilical.
- The common/cardinal vein forms the superior vena cava and inferior vena cava, while the pulmonary veins, coronary sinus, and oblique vein of the left ventricle also originate from the sinus venosus.
- The primitive atrium divides into the right and left atria.
- The atrioventricular sulcus divides the primitive atrium and primitive ventricle.
- The primitive ventricle originates superior to the primitive atrium and, if normal, will be inferior to it. It will give rise to trabecular expansion.
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Description
Explore the basic anatomy and development of the cardiovascular system in embryos and fetuses prior to Week 3. Learn about the formation of the endocardium and myocardium, the fusion of two tubes into a single endocardial tube, and its connection to the aortic arch system and sinus venosus.
