Cardiovascular System - Developmental Shunts: Difference between revisions
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==Ductus Venosus== | ==Ductus Venosus== | ||
The [[V#vitelline|vitelline]] blood vessel lying within the liver that connects (shunts) the portal and [[U#umbilical vein|umbilical veins]] to the inferior vena cava and also acts to protect the [[F#fetus|fetus]] from placental overcirculation. | |||
Absence can cause [[H#hydrops fetalis|hydrops fetalis]] and the umbilical vein then drains directly into the inferior vena cava or right atrium. | |||
Postnatally this shunt functionally closes then structurally closes and degenerates to form it the [[L#ligamentum venosus|ligamentum venosum]]. | |||
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| [[File:Stage 13 image 075.jpg|300px]] | | [[File:Stage 13 image 075.jpg|300px]] |
Revision as of 11:05, 6 May 2011
Introduction
Before birth there are three identified "shunts" in the mammalian cardiovascular system:
- the foramen ovale, within the heart between the atria
- the ductus arteriosus, within the aortic arch
- the ductus venosus, within the liver
Some Recent Findings
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Foramen Ovale
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Ostium Primum (week 4, stage 13) | Atrial septum (week 8, stage 22) |
Ductus Arteriosus
Week 8 (stage 22) Aortic Arch
Ductus Venosus
The vitelline blood vessel lying within the liver that connects (shunts) the portal and umbilical veins to the inferior vena cava and also acts to protect the fetus from placental overcirculation.
Absence can cause hydrops fetalis and the umbilical vein then drains directly into the inferior vena cava or right atrium.
Postnatally this shunt functionally closes then structurally closes and degenerates to form it the ligamentum venosum.
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Week 4 embryo (stage 13) Ductus Venosus | Week 8 Human embryo (stage 22) Ductus Venosus |
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Textbooks
- Human Embryology (2nd ed.) Larson Ch7 p151-188 Heart
- The Developing Human: Clinically Oriented Embryology (6th ed.) Moore and Persaud Ch14: p304-349
- Before we Are Born (5th ed.) Moore and Persaud Ch12; p241-254
- Essentials of Human Embryology Larson Ch7 p97-122 Heart
- Human Embryology Fitzgerald and Fitzgerald Ch13-17: p77-111
Molecular
Abnormalities
Atrial Septal Defect
- Foramen ovale defects are generally classes as atrial septal defects.
- Atrial Septal Defects (ASD) are a group of common (1% of cardiac) congenital anomolies defects occuring in a number of different forms and more often in females.
- Links: Atrial Septal Defects
Patent ductus arteriosus
- Ductus arteriosus
Patent ductus arteriosus classification
References
Reviews
<pubmed>21513818</pubmed>
Articles
<pubmed>16565980</pubmed> <pubmed>12589721</pubmed> <pubmed>6832717</pubmed>
17984953
Search PubMed
Search Pubmed: foramen ovale | ductus arteriosus | ductus venosus | heart shunt | cardiovascular shunts
Glossary Links
- Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link
Cite this page: Hill, M.A. (2024, June 20) Embryology Cardiovascular System - Developmental Shunts. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Cardiovascular_System_-_Developmental_Shunts
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G