Cardiac Embryology

Question 1

Where do blood islands appear/grow?

Answer 1

In the mesoderm

Question 2

What is the role of the blood islands?

Answer 2

They come together to form larger vessels and the heart tube

Question 3

What is angiogenesis?

Answer 3

Formation of new vessels from existing ones

Question 4

What forms the sinus venosus?

Answer 4

All the main veins coming together

Question 5

What does the septum primum do?

Answer 5

Splits the primitive atrium into 2 atria

Question 6

What is the hole inferior to septum primum? What does it do?

Answer 6

Ostium primum -> connects R and L atria

Question 7

Where does ostium secundum open? What does it do?

Answer 7

Within septum primum. It forms a flap 1 way valve allowing blood to pass from R to L but not from L to R

Question 8

What is the name for the hole between the atria?

Answer 8

Foramen ovale

Question 9

Where do septums grow towards?

Answer 9

Endocardial cushions

Question 10

Which 2 septums meet to close the ventricles?

Answer 10

Interventricular septum and the conotruncal ridge/septum