01b Aortic arches

Question 1

What happens during development to the 1st aortic arch

Answer 1

It mostly disappears and a small portion remains as the maxillary artery

Question 2

What happens during development to the 2nd aortic arch

Answer 2

It mostly disappears and a small portion persists as the Hyoid and Stapedial artery

Question 3

What happens during development to the 3rd aortic arch

Answer 3

Forms the 1st part of the internal carotid artery
External carotid originates from 3rd arch

Question 4

What happens during development to the 4th aortic arch

Answer 4

Left:
- Forms part of the aortic arch between common carotid and left subclavian arteries

Right:
- Proximal segment of the right subclavian artery

Question 5

What happens to the 5th aortic arch during development

Answer 5

Either never forms or forms incompletely and then regresses

Question 6

What happens to the 6th aortic arch during development

Answer 6

It forms the pulmonary arch

Left:
- proximal segment: proximal segment of left pulmonary artery
- distal segment persistes as ductus arteriosus

Right:
- proximal segment: proximal segment of right pulmonary artery
- Distal connection loses connection with dorsal aorta