Heart Embryology

Question 1

name the embryological fate of truncus arteriosus

Answer 1

• right: pulmonary trunk
• left: ascending aorta

Question 2

name the embryological fate of bulbus cordis

Answer 2

• right: conus arteriosus
• left: aortic vestibule

Question 3

name the embryological fate of primordial ventricle

Answer 3

• right ventricle: trabeculated part
• left ventricle: trabeculated part

Question 4

name the embryological fate of primordial atrium

Answer 4

• right atrium: rough-walled part
• left atrium: rough-walled part

Question 5

name the embryological fate of the right horn of sinus venosus

Answer 5

• right atrium: smooth-walled part (sinus venarum)

Question 6

name the embryological fate of the left horn of sinus venosus

Answer 6

• coronary sinus

Question 7

describe a patent foramen ovale

Answer 7

• most common ASD
• failure of fusion between septum primum and secundum

Question 8

describe a secundum type of ASD

Answer 8

• abnormally large foramen secundum or foramen ovale

Question 9

describe the primum type (ASD)

Answer 9

• endocardial cusion defect, incomplete
• foramen primum not closed
• often present in Down’s syndrome

Question 10

describe a sinus venosus type of ASD

Answer 10

• defective absorption of sinus venosus into right atrium