Changes

==Introduction==

==Introduction==

Blood vessel formation is a combination of the following three processes:

Blood vessel formation is a combination of the following three processes:

The first pair of aortic arch arteries atrophy and only remnants of the second pair persist as the stapedial arteries supplying the middle ear. The common, external and internal carotid arteries are all derived from the third aortic arch. The left fourth aortic arch contributes to the arch of the aorta and the right fourth aortic arch forms the proximal region of the right subclavian artery. The development of the sixth aortic arch arteries is complex with the proximal section of the left arch forming the proximal part of the left pulmonary artery and the distal region fashioning the ductus arteriosus. The proximal section of the right sixth aortic artery persists as the proximal region of the right pulmonary artery and the distal part atrophies.

The first pair of aortic arch arteries atrophy and only remnants of the second pair persist as the stapedial arteries supplying the middle ear. The common, external and internal carotid arteries are all derived from the third aortic arch. The left fourth aortic arch contributes to the arch of the aorta and the right fourth aortic arch forms the proximal region of the right subclavian artery. The development of the sixth aortic arch arteries is complex with the proximal section of the left arch forming the proximal part of the left pulmonary artery and the distal region fashioning the ductus arteriosus. The proximal section of the right sixth aortic artery persists as the proximal region of the right pulmonary artery and the distal part atrophies.

 

[[Category:Vascular System - Anatomy & Physiology]]

[[Category:Vascular System - Anatomy & Physiology]]