Anatomy Notes

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Western University
Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesFeb 912 The interventricular septum and wall are the same thing A ventricular septal defect occurs when the superior part of the interventricular septum fails to form leaving a hole between the two ventricles Blood mixes between the two ventricles and more blood moves from left to right because the left ventricle is stronger This occurs in 1 in every 500 births Transposition of great vessels The aorta comes from the RV and the pulmonary trunk from the LV It occurs when the bulbus cordis does not divide properly Blood is never refreshed and it just keeps getting circulated around the body Deoxygenated blood passes repeatedly around the systemic circuit while oxygenated blood recycles around the pulmonary circuit This occurs in 1 in every 1000 births Coarctation of the aorta A part of the aorta is narrowed or constricted which causes blood flow to be reduced and the work load on the LV to increase The LV grows in size This occurs in 1 in every 1500 births Pulmonary stenosis The pulmonary semilunar valve is narrowed causing the pulmonary trunk to be constricted and blood flow to the lungs to be reduced In older people the valves can become stiff which leads to heart murmurs Replacement of the semilunar valve is sometimes necessary This occurs in 1 in every 2800 births Tretralogy of Fallot There are multiple defects The pulmonary trunk is too narrow and the pulmonary valve is stenosed There is ventricular septal defect The aorta opens from both ventricles The wall of the RV is thickened from overwork This occurs in 1 in every 2000 births Coronary circulation consists of arteries and veins Blood supply to the walls and tissues of the heart is delivered by the right and left coronary arteries These systemic arteries arise from the base of the aorta within the leaflets of the semilunar valves and run in the coronary sulcus The left coronary artery arises from the left side of the aorta passes posterior to the pulmonary t
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