V. Developement of the Major Arteries
| STRUCTURE | RIGHT | LEFT |
| 1st Aortic Arch | most disappear (some forms maxillary art.) | most disappear (some forms maxillary art.) |
| 2nd Aortic Arch | most disappears | most disappears |
| 3rd Aortic Arch | proximal internal carotid artery | proximal internal carotid artery |
| Cranial Dorsal Aorta | distal internal carotid art. | distal internal carotid art. |
| Ventral Aorta between 3rd and 4th Arch | common carotid artery | common carotid artery |
| Ventral Aortic Root to 4th Arch | brachiocephalic artery | ascending aorta |
| Dorsal Aorta between 3rd and 4th Arch | disappears | disappears |
| 4th Aortic Arch | proximal right subclavian artery | arch of aorta |
| Dorsal Aorta between 4th arch and 7th intersegmental artery | middle of the subclavian artery | distal arch of the aorta |
| 7th intersegmental artery | distal subclavian artery | subclavian artery |
| 5th Aortic Arch | never developed | never developed |
| Proximal 6th Aortic Arch | proximal right pulmonary artery | proximal left pulmonary artery |
| Distal 6th Aortic Arch | disappears | ductus arteriosus |
| Dorsal Aorta below 7th Intersegmental artery to the Junction of the Dorsal Aorta | disappears | descending aorta |
VI. Development of the Major Veins
A. Superior and Inferior Vena Cava
| STRUCTURE | RIGHT | LEFT |
| Common Cardinal Vein | superior vena cava | coronary sinus |
| Proximal Ant. Cardinal V. | superior vena cava | superior intercostal vein |
| Thymicothyroid Anastomosis | brachiocephalic vein | |
| Intermediate Ant. Cardinal Vein | brachiocephalic vein | degenerates |
| 7th Intersegmental Vein | subclavian vein | subclavian vein |
| Distal Anterior Cardinal Vein | internal jugular vein | internal jugular vein |
| New Vessel | external jugular vein | external jugular vein |
B. Inferior Caval System
| STRUCTURE | RIGHT | LEFT |
| Vitelline Vein (Proximal) | proximal IVC and hepatic vein | hepatic vein |
| Subcardinal Vein and subcardinal Anastomosis | IVC (renal portion), renal, gonadal and suprarenal veins | gonadal, renal and suprarenal veins |
| Hepato-subcardinal anastomosis | IVC (hepatic segment) | none present |
| Distal Supracardinal Vein | IVC (postrenal segment) | |
| Proximal Supracardinal Vein | distal azygos vein | hemiazygos vein |
| Proximal Posterior Cardinal Vein | proximal azygos vein | |
| Distal posterior Cardinal vein | right common iliac vein | left common iliac vein |
C. Portal System
| STRUCTURE | RIGHT | LEFT |
| Proximal Vitelline V. | cephalic IVC & hepatic v. | hepatic v. |
| Middle Vitelline V. | broken up by hepatic sinusoids | broken up by hepatic sinusoids |
| Vitelline V. (caudal to liver with transverse anastomoses) | portal v. | portal v. |
| Distal Vitelline V. | superior mesenteric v. | ?splenic v.? |
| Proximal Umbilical V. | degenerates | degenerates |
| Distal Umbilical V. | degenerates | ligamentum teres |
| Ductus venosus | ligamentum venosum |