Vascular Embryology Flashcards

0
Q

How do vessels enlarge?

A

Fusion with smaller vessels

Enlargement of individual capillary beds

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1
Q

2 mechanisms of vascular development

A
  1. Vasculogenesis: coalescence of angioblasts (Major vessels such as dorsal aorta and cardinal veins)
  2. Angiogenesis: vessels sprout from existing vessels (remainder of vascular system)
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2
Q

Major arterial conduits in the early embryo

A

Dorsal aortas (continuation of endocardial tubes, arose from aortic sac)

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3
Q

Formation of the first pair of aortic arches

A

Cranial portions of the dorsal aortas create an arc on both sides of the foregut due to movement of the developing heart tube and pericardium

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4
Q

3mm embryo

A

1st pair of aortic arches large
2nd pair just forming
All other arches form from aortic sac

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5
Q

Aortic arch one becomes

A

Maxillary artery

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6
Q

Aortic arch two becomes

A

Stapedial artery

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7
Q

Primitive pulmonary artery comes from which arch?

A

Aortic arch 6

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8
Q

What happens when the turn aortic sac divides?

A

Aortic arch 6 is now continuous with the pulmonary trunk

Starting to lose symmetry

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9
Q

Inter segmental arteries are important in the formation of?

A

Subclavian arteries

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10
Q

Aortic arch 3 forms:

A

Common carotid artery and first part of internal carotid

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11
Q

Aortic arch 4 forms:

A

Left side: aortic arch between L common carotid and L subclavian
Right side: proximal right subclavian

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12
Q

Another name for arch 6

A

Pulmonary arch

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13
Q

Aortic arch 6 becomes:

A

Dorsal portion of right arch 6 disappears
Proximal part of right arch becomes right pulmonary artery
Distal Left arch becomes ductus arteriosus
Proximal left arch becomes proximal left pulmonary artery

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14
Q

Ductus arteriosus at birth

A

Normally obliterates, forming ligamentum arteriosum

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15
Q

Aortic sac becomes

A

Ascending aorta
Aortic arch
Brachiocephalic artery

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16
Q

Right dorsal aorta becomes

A

Right subclavian

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17
Q

Left dorsal aorta becomes

A

Distal aortic arch and descending aorta

18
Q

Right intersegmental artery becomes:

A

Right subclavian

19
Q

Left intersegmental artery becomes:

A

Left subclavian

20
Q

Major point of entry into common atria

A

Sinus venosus

21
Q

In 4mm embryo, 3 distinguishable parts of sinus venosus

A

Central (unpaired) portion
Transverse portion
Right and left sinus horns

22
Q

Blood supply to the sinus venosus, week 4:

A

Sinus venosus receives blood via right and left horns

Each horn receives blood from vitelline, umbilical, and common cardinal veins

23
Q

Communication between the sinus and atrium is initially wide open, what causes a shift from this?

A

Shifts to the right due to shift in blood in venous system

Occurs at about 4-5 weeks

24
Fate of right umbilical vein, left vitelline vein, and left common cardinal vein
Obliterated week 5: right umbilical and left vitelline veins -Left horn no longer important Obliterated week 10: left common cardinal vein -all that remains of left sinus horn is oblique vein of the LA and the coronary sinus
25
Only communication between the original sinus venosus and the atrium?
Right sinus horn - shunts blood left to right, so right sinus horn enlarges - forms the smooth wall part of the right atrium
26
Left sinus horn and right sinus horn become?
Left sinus horn: oblique vein of LA and coronary sinus | Right sinus horn: smooth wall of RA
27
Valvular fold on either side of the sinuatrial orifice:
Left venous valve: fuses with atrial septum Superior right venous valve: disappears Inferior right venous valve: becomes valve of IVC and valve of right coronary sinus
28
Function of vitelline veins:
Carry blood from yolk sac to sinus venosus
29
Function of umbilical vein:
Originate in chorionic villi and carry OXYGENATED blood to the embryo
30
Function of common cardinal veins:
Drain the body of the embryo
31
In primitive heart tube, left and right sinus horns drain into?
Central sinoatrial orifice
32
Where does the vitelline venous system enter and what does it give rise to?
Enters sinus venosus | Gives rise to hepatic veins
33
Were does the umbilical venous system enter and what does it give rise to?
Enters sinus venosus lateral to vitelline veins | Persists as umbilical vein in the fetus
34
Where does the cardinal venous system enter and what does it give rise to?
Enters sinus venosus lateral/superior to the umbilical veins | Forms a large complex network of veins throughout body
35
Fate of left vitelline vein
Disappears
36
Fate of right vitelline vein
Becomes hepatic veins and all other veins of hepatic portal system
37
Fate of left umbilical vein
Joins hepatic system, bit still persists in fetus as umbilical vein
38
Fate of right umbilical vein
Subcardinohepatic anastomosis
39
What does the left sinus horn become?
Coronary sinus
40
Right side of the subcardinal venous system develops into?
Principle venous channels to the heart from lower body
41
Anterior and posterior cardinal veins:
Anterior drain the upper limbs | Posterior mostly disappear (so even greater demand on right subclavian vein)
42
Chamber between the anterior cardinal veins:
Brachiocephalic vein | Drains entire head and upper extremities
43
Sub cardinal veins completely fuse to become:
IVC