Embryology (Heart Development)

Question 1

Truncus Arteriosus Derivatives

Answer 1

• Ascending aorta
• Pulmonary trunk

Question 2

Initial Heart Function

Answer 2

• One way pump
• Gets O2 rich blood from placenta to embryo

Question 3

Primitive Atria Derivatives

Answer 3

• Auricles of left and right atria

Question 4

Conus Cordis (upper bulbisn cordis) Derivatives

Answer 4

• Outflow tract for ventricles
• Conus arteriosus for RV
• Aortic vestibule for LV

Question 5

Primitive Ventricle Derivatives

Answer 5

• Trabeculated LV

Question 6

Embryonic Folding (2)

Answer 6

• brings 2 endocardial tubes into thorax to form one tube
• takes 2 days

Question 7

Bulbis Cordis Derivatives

Answer 7

• Trabeculated RV

Question 8

Partitioning of Primitive Heart (4)

Answer 8

Separates:

1. artia from ventricles
2. right & left atria
3. right & left ventricles
4. Pulmonary trunk & ascending aorta

Question 9

Right Horn of Sinus Venosus Derivatives

Answer 9

• Smooth part of the right atrium (sinus venarum)

Question 10

Septum Primum & Secundum (3)

Answer 10

• Hole at the top of one and bottom of the other allow blood to pass between RA & LA
• Get pushed together after birth to stop that flow
• Called foramen ovale after birth

Question 11

Primitive Pulmonary Veins Derivatives

Answer 11

• Smooth part of left atrium

Question 12

Blood Flow

Answer 12

Body -> RA -> RV -> Lungs ->LA -> LV -> Body

Question 13

Left Horn of Sinus Venosus Derivatives

Answer 13

• Coranary sinus