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Term I: Embryology > Development of Venous System > Flashcards

Development of Venous System Flashcards

1
Q

What are the 3 pairs of veins that each of the right and left sinus horns receives blood
from?

A

vitelline (omphalomesenteric) veins, umbilical veins, common cardial veins

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2
Q

The _____ divides the embryonic cavity into thorax and abdominal cavities

A

septum transversum

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3
Q

What do the vitelline veins (1st veins formed) arise from?

A

capillary plexus of the yolk sac

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4
Q

What is the extensive vascular network that forms partially from the vitelline veins?

A

hepatic sinusoids

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5
Q

Which side are most venous structures on?

A

Right b/c RA must receive venous blood

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6
Q

We start with paired vitteline veins. But one disappears – which one?

A

Left one disappears, so blood is channeled to the right vitelline vein creating the right
hepatocardiac channel

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7
Q

What does the right vitelline vein (hepatocardiac channel) become?

A

Terminal portion of the IVC

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8
Q

What does the portal system drain?

A

blood from the GI tract to the hepatic sinusoids

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9
Q

What are all the major derivatives of the vitelline veins?

A

hepatic sinusoids, the portal vein and superior mesenteric vein, the terminal IVC

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10
Q

What do the vitelline or omphalomesenteric veins do?

A

Carry blood from the yolk sac to the sinus venosus

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11
Q

What do the umbilical veins do and where do they originate?

A

Carry oxygenated blood from the placenta to the sinus venosus; originate in the
chorionic villi

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12
Q

What do the cardinal veins do?

A

Carry blood from the body of the embryo to the sinus venosus

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13
Q

Which umbilical vein disappears?

A

The RIGHT vein disappears. The left umbilical vein carries OXYGENATED blood
from the placenta to the liver

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14
Q

What do the left umbilical and right vitelline veins do?

A

left umbilical vein delivers blood to the “liver” and the right vitelline vein (portal
system) delivers blood to the “liver” as well

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15
Q

What are the derivatives of the umbilical veins?

A

No derivatives, one remnant: ligamentum teres hepatis (edge of falciform ligament)

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16
Q

Which cardinal veins drain the superior embryo?

A

Anterior cardinal veins (AS-IP acronym)

17
Q

Which does the posterior cardinal vein drain?

A

Inferior embryo (rest of body=caudal) (AS-IP acronym)

18
Q

The distal portion of the anterior cardinal veins become what

A

Internal jugular veins

19
Q

When the left anterior cardinal vein obliterates, what is the remnant?

A

Coronary sinus

20
Q

What does the anastomosis between the anterior cardinal veins become

A

Left brachiocephalic vein

21
Q

The proximal right anterior and right common cardinal veins become the

A

SVC

22
Q

Which two sets of veins are created as the embryo needs more circulation during the 5th-
7th weeks of development? These replace the posterior cardinal veins

A

supracardinal veins (body wall), subcardinal veins (kidneys and gonads)

23
Q

Blood from the intercostal veins (think somites) drain into the

A

supracardinal veins

24
Q

What is the advantage of the presence of the azygous vein?

A

blood can “bypass” the IVC. If the vena cava is occluded, blood can return to the heart
via the azygous systems – alternate drainage of the body to the heart

25
Q

Which side does the hemizygous vein run on?

A

left

26
Q

Which part of the posterior cardinal veins persist?

A

The most caudal portion, which anastomoses with the supracardinal veins

27
Q

The terminal portion of the IVC (between heart and liver) is from what?

A

right vitelline vein

28
Q

The part of the IVC between the liver and kidney is from what?

A

right subcardinal vein

29
Q

Inferior to the kidney on the IVC is formed from what?

A

right supracardinal vein

30
Q

The sacral segment of the IVC is from what?

A

right and left posterior cardinal veins

31
Q

What does the lymphatic system develop from?

A

splanchopleuric mesoderm like blood vessels

Term I: Embryology (16 decks)

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