Embeyology: Outflow Tract Septation

Question 0

Aorticopulmonary septum

Answer 0

Formed by the fusion of the right superior and left inferior cushions
Divides the truncus into aortic and pulmonary channels

Question 1

Opposing ridges in the truncus Week 5: location and growth

Answer 1

Cushion on right superior wall grow distally and to the left
Cushions on the left inferior wall grow distally and to the right
Both grow toward aortic sac, twist around each other, and fuse

Question 2

Division of the conus into the anterolateral (RV outflow) and posteriomedial (LV outflow) portions

Answer 2

Cushions on the right dorsal and left ventral walls of conus cordis grow towards each other and distally the. Unite within the truncus septum

Question 3

Day 29: Partioning of the outflow tract into:

Answer 3

Truncus arteriosus: aorta

Conus cordis: pulmonary artery

Question 4

AV valve formation

Answer 4

Each AV orifice is surrounded by Local proliferations of mesenchymal tissue
Blood hollows out and things the tissue on the ventricular surface
Valves form (remain attached to ventricular wall)

Question 5

Semilunar valves: location and formation

Answer 5

Small tubercles found on main truncus swellings

Tubercles hollow out on upper surface

Question 6

Day 55

Answer 6

Valves are fully developed