ANAT 214 Lecture Notes - Lecture 9: Ductus Arteriosus, Circulatory System, Heart Sounds
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25 Jan 2018
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Septo-marginal band: only in the right ventricle, allows the conduction to happen very quickly, carries the purkinje fibers to the lateral wall, carries part of the right bundle branch of the av bundle to the papillary muscles. Development and changes in the heart at birth: the interatrial wall/ septum (foramen ovalis) acts as a shunt for oxygenated blood (from placenta) in the right atrium to. It shoots the blood straight into the left atrium which passes it directly to the systemic circulation without going to the lungs: ra --> la --> lv --> aorta. Video of ultrasound: to show the valve on the foramen ovalis. If the ductus arteriosus stays open after birth there will be mixing of blood and respiratory problems: mostly in premature babies. There are specific places on the chest to listen to the heart sounds (put things in context: the second intercostal space is where you best hear the aortic valve.
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