Question
| A. | Ascending aorta |
| B. |
Descending aorta |
| C. |
Common carotid artery |
| D. |
Pulmonary trunk |
|
Correct Answer � B Explanation |
 |
Answer is B. Descending aorta
Embryological dorsal aorta forms distal part of descending aorta.
Proximal part of descending aorta develops from
Left dorsal aorta distal to attachments of fourth arch artery and
Distal part from fused dorsal aortae forming single median artery.
Ascending aorta and pulmonary trunk develops from truncus arteriosus (a part of heart tube).
Common carotid artery develop from aortic arch III.
|
Arteries |
Source of development |
|
Arch of aorta |
(A)Aortic sac (ventral part), (B)Left horn of aortic sac, and (C)Left fourth arch artery |
|
Brachiocephalic artery |
Right horn of aortic sac |
|
Right subclavian artery |
Proximal part from right fourth arch artery and (b) distal part from right seventh cervical intersegmental artery |
|
Left subclavian artery |
Left seventh cervical intersegmental artery |
|
Common carotid artery |
Third arch artery proximal to the external carotid artery bud |
|
Internal carotid artery |
Third arch artery distal to the external carotid bud and cranial part of dorsal aorta distal to the attachment of third arch artery |
|
External carotid artery |
Bud from third arch artery |
|
Pulmonary arteries |
Part of the sixth arch artery between pulmonary trunk and branch to lung bud on each side |
|
Descending aorta |
(A)Proximal part from left dorsal aorta distal to attachment of fourth arch artery and (b) Distal part from fused dorsal aortae forming single median artery. |