Cardiovascular System - Coronary Circulation Development
Introduction
The coronary circulation provides the blood supply to the heart required for the normal muscular function. From recent mouse studies, the origin of this specialised vasculature is from the sinus venosus.
Development of the heart and vascular system begins very early in mesoderm both within (embryonic) and outside (extra embryonic) the embryo. Vascular development therefore occurs in many places, the most obvious though is the inflow and outflow in the forming heart, which grows rapidly creating an externally obvious cardiac "bulge" on the early embryo.
The coronary circulation an important medical topic postnatally. Blockage and failure of this system leads initially to angina, continued ischemia leads to hypoxic death of cardiac muscle and myocardial infarction, a heart attack.
For general information about blood vessel development, see Blood Vessel Development and note that blood vessels also occurs outside the embryo in the extra-embryonic mesoderm of the yolk sac (vitelline) and in the villi of the placenta.
Some Recent Findings
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(More? recent references)
Coronary Vessel Anatomy
Coronary Arteries
- Right coronary artery (RCA)
- Left coronary artery (LCA)
Coronary Veins
- Great Cardiac Vein (left coronary vein) - empty directly into the coronary sinus
- Coronary sinus - empty directly into the right atrium.
- Anterior cardiac veins - empty directly into the right atrium.
Mouse Coronary Vessel Development
Image showing changes in venous (blue) and arterial (red) marker expression during coronary development; black indicates dedifferentiated venous cells.[1]
Abnormalities
Anomalous Left Coronary Artery from the Pulmonary Artery
Anomalous origin of left coronary artery from pulmonary artery (ALCAPA) is a rare malformation (incidence of 0.25–0.50% )in children with abnormal cardiac development leading to a mortality rate of 90% in unoperated infants.[3] There are a variety of surgical repair techniques including: direct aortic implantation, a modified tubular extension technique, and an intrapulmonary baffling technique.[4]
Anomalous Right Coronary Artery from the Left Sinus
Ectopic Origin of the Right Coronary Artery
The right coronary artery arises outside the borders of the right coronary sinus, the most common locations are the left sinus (either the anterior, superior portion) or directly from the left main coronary artery. Anterior displacement is the most prevalent anatomical variant.[5] Also very rarely arising from other anatomical locations including; the non-coronary (posterior) sinus, left anterior descending coronary artery, left circumflex coronary artery, pulmonic artery, and the descending aorta. Clinically seen as cardiac ischemia and arrhythmia.
Anomalous Sinus Node Artery
The sinus node artery normally originates from the proximal segment of the right coronary artery, left circumflex artery, or from both. With anomalous sinus node artery this vessel can originate from the left anterior descending artery.
References
- ↑ 1.0 1.1 <pubmed>20336138</pubmed>
- ↑ <pubmed>18093989</pubmed>
- ↑ <pubmed>7949665</pubmed>
- ↑ <pubmed>19808708</pubmed>| Interact Cardiovasc Thorac Surg.
- ↑ <pubmed>20197575</pubmed>| J Invasive Cardiol.
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Additional Images
See also Category:Heart ILP and Category:Heart
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Cite this page: Hill, M.A. (2024, June 16) Embryology Cardiovascular System - Coronary Circulation Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Cardiovascular_System_-_Coronary_Circulation_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G