Anomalous Origin of the Left Coronary Artery
Occasionally, the left coronary artery is found to arise from the pulmonary artery, and rarely from other aortic arch vessels. The developing coronary vessels perforate the aortic annulus in association with specific immunohistochemical markers, and so it is likely that when this patterning event is altered, anomalies occur.
Numerous variations in the architecture and course of the coronary arteries occur in association with structural cardiovascular malformations. For example, an anomalous origin of the left anterior descending coronary artery from the right coronary artery occurs in association with tetralogy of Fallot. Unfortunately, the mechanisms for these associations have not been defined.
Coronary arterial fistulas occasionally occur in isolation and also occur in association with pulmonary valve atresia with an intact ventricular septum. The mechanics responsible for these anomalies are unknown.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.