Development Of The Heart

Question 1

What is the sinus venosus?

Answer 1

The sinus venosus are the vessels coming into the primitive atrium.

Question 2

What is the ductus arteriosus?

Answer 2

The ductus arteriosus is a vessel that exists in the foetus to shunt blood from the pulmonary artery to the aorta before the lungs are functioning. This vessel should close shortly after birth as the pressure in the pulmonary artery drops following perfusion of the lungs.

Question 3

What is septation?

Answer 3

The primitive chambers must be divided to create the 4 chambers and to achieve selective outflow. Septation is the development of the interatrial septum, interventricular septum and the pulmonary trunk and aorta.

Question 4

What does the ductus arteriosus become in the developed circulation?

Answer 4

Ligamentum arteriosum.

Question 5

What does the bulbus cordis go on to form?

Answer 5

The bulbus cordis will form the trabeculated part of the right ventricle.