aortic arches and venous system Flashcards
Aortic Sac
• Ascending Aorta • Aortic Arch • Brachiocephalic Artery
First Arches
• Maxillary Artery (portion)
Second Arches
• Stapedial Artery (portion)
Third Arches
Carotid Arteries
Fourth Arches
- Right – Proximal Right Subclavian Artery
* Left – Aortic arch segment between left carotid and left subclavian artery
Fifth Arches
Transient and never well-developed
• Sixth Arches
- Right – • Proximal - Proximal right pulmonary artery • Distal - distal portion disappears
- Left – • Proximal – Proximal left pulmonary artery • Distal–DuctusArteriosus
Right Dorsal Aorta
• Portion becomes the right subclavian
Left Dorsal Aorta
Distal aortic arch and descending aorta
Right Intersegmental Artery
Part of right subclavian artery
Left Intersegmental Artery
Left subclavian artery
Communication will eventually shift to the right
Occurs at about 4-5 weeks.
Obliteration of the right umbilical vein and left vitelline vein • Occurs
5th week
At week 10
left common cardinal vein become obliterated
All that remains of the left sinus horn is the
oblique vein of the left
atrium and the coronary sinus.
Left venous valve fuses
with the atrial septum
Superior part of the right venous valve
disappaers
Inferior part of the right venous valve becomes
the valve of the inferior vena cava and the valve of the coronary sinus.
Vitellineveins
Carry blood from the yolk sac to the
sinus venosus
Umbilicalveins
Originate in the chorionic villi and carry
oxygenated blood to the embryo
Common cardinal veins
Drain the body of the embryo
Vitelline venous system
Enters the sinus venosus • Gives rise to the hepatic veins
Umbilical venous system •
Enter the sinus venosus lateral to the vitelline veins. • Persists as the umbilical vein in the term fetus.
• Cardinal venous system
• Enters the sinus venosus lateral/superior to the umbilical veins • Forms a large complex network of veins throughout the body.
Right Vitelline vein is transforming into a structure
that will eventually be the hepatic veins and all of the veins of the hepatic portal system.
The left umbilical vein has joined
the hepatic system.
The left umbilical vein will persist in the fetus as the umbilical vein.
subcardinohepatic anastomosis
This was once the right umbilical vein.
left sinus horn eventually becomes
coronary sinus. left oblique vein of LA
The anterior cardinal veins now have a channel between them
(the left brachiocephalic vein).
• These cardinal veins will drain the entire head and upper extremities.
