Embryology

Question 1

Forms ascending aorta and pulmonary trunk

Answer 1

Distal portion of bulbus cordis (truncus arteriosus). Proximal conus gets absorbed into primitive ventricle

Question 2

Partitions into right and left ventricles

Answer 2

Primitive Ventricle

Question 3

Partitions into right and left atria

Answer 3

Primitive Atrium

Question 4

Gets absorbed into right atrium. Left horn regresses to form part of coronary sinus.

Answer 4

Sinus venosus

Question 5

Greater part disappears. Remnants form the maxillary artery

Answer 5

1st arch artery

Question 6

Greater part disappears. Remnants form the stapedial artery

Answer 6

2nd arch artery

Question 7

Becomes common carotid and internal carotid arteries on either side

Answer 7

3rd arch artery

Question 8

Becomes subclavian artery on right and aortic arch on left

Answer 8

4th arch artery

Question 9

This arch artery disappears

Answer 9

5th arch artery

Question 10

Artery to developing lung bud on either side. Form the pulmonary artery on either side and ductus arteriosus on left

Answer 10

6th arch artery

Question 11

Primitive truncus arteriosus becomes

Answer 11

Ascending aorta and pulmonary trunk

Question 12

Ventral portion of aortic sac, left horn of aortic sac and left 4th arch artery become

Answer 12

Aortic arch: Ventral portion of aortic sac, left horn of aortic sac (proximal arch), left 4th arch artery (distal arch)

Question 13

Left dorsal aorta becomes

Answer 13

Descending aorta

Question 14

Right horn of aortic sac becomes

Answer 14

Brachiocephalic

Question 15

3rd arch artery becomes

Answer 15

Carotid

Question 16

Right from the right 4th arch + right 7th cervical inter-segmental artery Left from the left 7th cervical intersegmental artery becomes

Answer 16

Subclavian

Question 17

6th arch between the pulmonary trunk and branch to lung bud

Answer 17

Pulmonary artery

Question 18

6th arch between the branch to lung bud and dorsal aorta

Answer 18

Ductus arteriosus

Question 19

Forms from connection between buds that arise from the aortic sinuses of Valsalva and the epicardial arterial plexus.

Answer 19

Coronary arteries.

Question 20

Normal visceroarterial anatomic arrangement

Answer 20

Solitus

Question 21

Visceroarterial mirror image of normal

Answer 21

Inversus

Question 22

Visceroarterial relationship is ambiguous, description not possible

Answer 22

Ambiguous

Question 23

Morphologic RV on R side, morphologic LV on L side

Answer 23

D-Loop: the normal “right-handed” arrangement

Question 24

Morphologic RV on the L side, morphologic LV on the R side

Answer 24

L-Loop: mirror image of normal; a “left-handed” arrangement

Question 25

Great arteries: Anterior and leftward PA, posterior and rightward aorta

Answer 25

Solitus- the normal anatomic arrangement

Question 26

Great arteries: Anterior and rightward PA, posterior and leftward aorta

Answer 26

Inversus- mirror image of normal arrangement

Question 27

Great arteries: Rightward and anterior aorta with leftward and posterior PA

Answer 27

Dextro transposition

Question 28

Mirror image of D-transposition, which leads to leftward and an-
terior aorta with rightward and posterior PA.

Answer 28

Levo transposition