Cardiovascular embryology

Question 1

The diagram below shows the heart at around 14 days gestation and what is derived from the primative structures:

Answer 1

Question 2

Embryonic structure - Truncus arteriosus?

Answer 2

• Ascending aorta and pulmonary trunk
• The division of the truncus arteriosus is triggered by neural crest cell migration from the pharyngeal arches.
• Problems with the migration may lead to transposition of the great arteries or tetralogy of Fallot

Question 3

Embryonic structure - Bulbis Cordis

Answer 3

• Right ventricle
• smooth parts of left ventricle

Question 4

Embryonic Structure - Primitive Atria

Answer 4

• Trabeculated parts of the left and right atria

Question 5

Embryonic Structure - Primitive ventricle

Answer 5

• Majority of left ventricle

Question 6

Embryonic Structure - Left horn of the sinus venous

Answer 6

• Coronary sinus

Question 7

Embryonic Structure - Right horn of the sinus venous

Answer 7

• Smooth part of the right atrium

Question 8

Embryonic Structure - Right common cardinal vein and right anterior cardinal vein

Answer 8

• Superior Vena Cava

Question 9

Embryonic Structure - Foramen ovale

Answer 9

• Foramen Ovalis

Question 10

Embryonic Structure - Umbiliacal Artery

Answer 10

• Medial umbilical ligaments

Question 11

Embryonic Structure - Umbilical Vein

Answer 11

• Ligamentum teres hepatis (inside falciform ligament)

Question 12

Embryonic Structure - Ductus arteriosus

Answer 12

• Ligamentum arteriosum

Question 13

Ligamentum arteriosum - Ductus Venous

Answer 13

• Ligamentum venosum

Question 14

Ligamentum arteriosum - Allantois

Answer 14

• Urachus