CDS 225 Cardio Vascular Anatomy: Embryo and Fetal Circulation

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Questions and Answers

What is the embryonic origin of the sinus venosus?

Formation of the myocardium

Union of 3 veins (correct)

Development of a single endocardial tube

Fusion of the two tubes on the midline

On what day does the fusion of the two heart tubes into a single endocardial tube occur?

Day 18-20

Day 29-31

Day 25-27

Day 21-23 (correct)

Which structure does the primitive atrium divide into?

Oblique vein of left ventricle and posterior of right and left atria

Superior and inferior vena cava

Right and left atria (correct)

Pulmonary veins and coronary sinus

What does the primitive ventricle originate superior to?

Primitive atrium Signup and view all the answers

Which vein does the sinus venosus form?

Coronary Sinus Signup and view all the answers

What is the endocardium's relation to the myocardium?

Inner thinner layer compared to the outer thicker layer Signup and view all the answers

True or False. Sinus Venosus are formed by the union of 3 veins, Common or cardinal, Vitelline, and umbilical

True Signup and view all the answers

The Primitive Atrium

Divides into right and left atria Signup and view all the answers

Atrioventricular Sulcus: divides primitive atrium and primitive

True Signup and view all the answers

This will give rise to trabecular expansion with inferior growth that will form the apical portion of the left ventricle

Primitive ventricle Signup and view all the answers

this will also contribute to the inlet portion of the right ventricle

Primitive ventricle Signup and view all the answers

What divides the primitive ventricle and the bulbus cordis

Interventricular sulcus Signup and view all the answers

The bulbus Cordis can be divided into three separate parts

True Signup and view all the answers

the proximal bulbus cordis will give rise to a trabecular expansion with inferior growth that will form part of the right ventricle

True Signup and view all the answers

this connects the primitive right ventricle with the truncus arteriosus

midportion of the bulbus cordis called the conus cordis Signup and view all the answers

this will form the aorta and the main pulmonary artery

The distal bulbus cordis, called the truncus arteriosus, Signup and view all the answers

Aortic sac will rise to form the five pairs of the aortic arches.

True Signup and view all the answers

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.