Cardiovascular Development 1

Question 1

WHat is the ductus venosus?

Answer 1

Allows for blood to bypass liver without nutrients being filtered at liver

Question 2

What causes closure of ductus arteriosus?

Answer 2

Increase in O2 content stimulates closure

Question 3

What occurs upon closure of ductus arteriosus?

Answer 3

Formation of ligamentum arteriosum

Increase in pressure of left side of heart which equalizes pressure in the right and left atria, which closes the foramen ovale

Question 4

What causes for closure of foramen ovale?

Answer 4

Increase in pressure on left side of heart

Question 5

What causes for closure of ductus venosus?

Answer 5

No blood flowing through it due to cutting of umbilical cord

Question 6

What is responsible for formation of lig. teres hepatis

Answer 6

Stretching of umbilicus which stimulates closing of umbilical veins which results in formation of lig. teres hepatis

Question 7

What is the free edge in the falciform ligament?

Answer 7

Lig. Teres hepatis

Question 8

When does cardiovascular development begin?

Answer 8

When embyo can no longer depend on diffusion becuase it is too large and has too many cells

Question 9

What is peristent right aortic arch also known as?

Answer 9

Vascular ring

Question 10

What is persistent right aortic arch?

Answer 10

Aorta develops on right side not left side

• Normal development of arch 6
• abnormal development of arch 4
• Wrong side is released and you get trapping of esophagus

Question 11

What structures do the aortic arches surround?

Answer 11

Trachea

Esophagus

Question 12

What occurs to the first 2 arches?

Answer 12

Atrophy and disapear

Question 13

What do the 3rd arches form?

Answer 13

Common carotid arteries and proximal segments of the internal carotid artery

Question 14

What is the segment of the dorsal aorta between the 3rd and 4th arches called?

Answer 14

Carotid duct

Question 15

What happens to the carotid duct?

Answer 15

Atrophies and disapears

Question 16

What does the right 4th arch form?

Answer 16

Right subclavian artery

Question 17

What does the left 4th arch form

Answer 17

Definitive aortic arch

Question 18

What are the 6th arches referred to as?

Answer 18

Caudal or pulmonary arches

Question 19

What does the proximal segment of the left caudal arch form?

Answer 19

Pulmonary Trunk

Distal segment forms the muscular ductus arteriosus

Question 20

What does the proximal segment of the right caudal arch form?

Answer 20

Proximal right artery

• Distal segment atrophies

Question 21

What grows distally as branches from the proximal left and right caudal arches?

Answer 21

Left and right pulmonary arteries

Question 22

What is the most likely cuprate of a young animal regurgitating shortly after beginning on solid food?

Answer 22

Vascular Ring

Question 23

What must be done with megaesophagus?

Answer 23

Unforgiving and you must feed the dog upright so that gravity helps move food through