Lecture 41: Heart Development II Flashcards
When does atrial partitioning begin?
5th week of development
Name the downward growth from cephalic wall of single atrium to endocardial cushion that separates the atrium into left and right chambers.
Interatrial septum primum
Name the septum that forms to the right of the septum primum and grows dorsoventrally.
Interatrial septum secundum
Name the space between the leading edge of septum primum and endocardial cushion that creates a right to left atrial shunt.
Interatrial foramen primum
Name the space that forms at the cephalic end of the septum primum through apoptosis and continues right to left atrial shunt.
Interatrium foramen secundum
What space forms within the septum secundum?
Foramen ovale
What forms from the 3rd pair of aortic arches?
Internal carotids
What forms the 4th pair of aortic arches?
R: R subclavian artery; L: Aortic arch
What forms from the 6th pair of aortic arches?
Pulmonary system
What structure permits oxygenated placental blood to bypass the capillary network of the liver?
Ductus venosus
What does the left umbilical vein become near the end of development?
Hepatic portal vein
What is the fate of the right vitelline vein near the end of development?
Becomes IVC
