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19 Cards in this Set
- Front
- Back
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What is the adult remnant of the right and left umbilical arteries?
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Medial umbilical ligaments
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What is the adult remnant of the left umbilical vein?
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Ligamentum teres
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What is the adult remnant of the ductus venosus?
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Ligamentum venosum
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What is the adult remnant of the Foramen ovale?
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Fossa ovale
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What is the adult remnant of the Ductus arteriosis?
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Ligamentum arteriosum
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What fetal structure corresponds to the medial umbilical ligament?
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Right and Left umbilical arteries
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What fetal structure corresponds to the ligamentum teres?
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Left umbilical vein
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What fetal structure corresponds to the ligamentum venosum?
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Ductus venosum
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What fetal structure corresponds to the fossa ovale?
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Foramen ovale
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What fetal structure corresponds to the ligamentum arteriosum?
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Ductus arteriosus
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What three shunts are involved in fetal circulation?
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1. Ductus venosus
2. Ductus arteriosus 3. Foramen ovale |
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What carries oxygenated blood from the placenta to the fetus?
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Left umbilical vein
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Describe the pathway of blood from the left umbilical vein to the heart in the fetus
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1. From the left umbilical vein some blood percolates through the hepatic sinusoids
2. Most of the blood bypasses the sinusoids by passing through the ductus venosus and eneters the IVC 3. From the IVC, blood enters the right atrium |
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Describe the pathway of blood within the heart of the fetus
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1. From the IVC, blood enters the right atrium
2. Most of the blood bypasses the right ventricule through the foramen ovale to enter the left atrium 3. From the left atrium, blood enters the left ventricle 4. Blood is delivered to fetal tissues via the aorta |
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What carries poorly oxygenated and nutrient-poor fetal blood back to the placenta?
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Right and Left umbilical arteries
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Describe what happens to blood from the right atrium that enters the right ventricle of the fetus
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1. Blood in the right ventricle enters the pulmonary trunk
2. Most of the blood bypasses the lungs through the ductus arteriosis |
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Describe fetal lungs
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1. They receive only a minimal amount of blood for growth and development
2. The blood is returned to the left ventricle via pulmonary veins 3. Fetal lungs are not capable of performing their adult respiratory function because they are functionally immature and the fetus is underwater |
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What provides respiratory function for the fetus?
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Placenta
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Describe the changes in the circulatory system at birth
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1. Circulatory system changes at birth are facilitated by a decrease in RA pressure and increase in LA pressure
a. Decrease in RA is from occlusion of placental circulation b. Increase in LA pressure is due to increased pulmonary venous return 2. Changes include closure of the right and left umbilical arteries, left umbilical vein, ductus venosus, ductus arteriosus, and foramen ovale |
