Embryology Flashcards
1
Q
What is patent ductus arteriosus?
A
Persistent communication between the descending aorta and pulmonary artery due to failure of physiological closure
2
Q
When does the cardiovascular system begin to develop?
A
During gastrulation (week 3)
3
Q
What is the function of the ductus venosus?
A
To by pass blood flow to the liver, instead transporting blood from the placenta to the inferior vena cava
4
Q
What is the function of the foreman ovale?
A
To transport blood directly from them right atrium to the left atrium, avoiding the lungs
5
Q
What is the function of ductus arteriosus?
A
To by pass the lungs, by allowing blood to flow from the pulmonary trunk directly to the aorta
6
Q
Describe the changes to the circulatory system that occur at birth
A
- Respiration begins, so left atrium increases and foramen ovalis closes
- Ductus arteriosus contracts and undergoes a physiological change, closing it
- Placental support is removed, so ductus venosus closes
