aortic valve closure
so that we can differentiate the right lung and left lung. the lung with the cardiac notch is the left lung as the heart is on the left side of the body.
If you see the cardiac cycle and you see the dichrotic notch, and there is a slight elevation of the aortic pressure after this notch, that's because of the pressure exerted by the elastic recoil of the aorta. Just imagine a bigger hill, followed by a smaller hill and the indentation between these two hills is the dichrotic notch and the hill after this notch is the graphic representation of the elastic recoil of the aorta. Hope this helps.
When the aortic semilunar valve snaps shut, a momentary increase in the aortic pressure results from the elastic recoil of the aorta after valve closure.
The jugular notch, or suprasternal notch, is in line with/at the level of the intervertebral junction between the second and third thoracic vertebra (between T2 & T3).
greater ischiadic (sciatic) notch
left lung has a cardiac notch.
A deep notch in the alimentary canal at the junction of the esophagus and the stomach.
so that we can differentiate the right lung and left lung. the lung with the cardiac notch is the left lung as the heart is on the left side of the body.
to accommodate the heart
Only the left lung has these features.
LEFT
A deep notch in the alimentary canal at the junction of the esophagus and the stomach.
If you see the cardiac cycle and you see the dichrotic notch, and there is a slight elevation of the aortic pressure after this notch, that's because of the pressure exerted by the elastic recoil of the aorta. Just imagine a bigger hill, followed by a smaller hill and the indentation between these two hills is the dichrotic notch and the hill after this notch is the graphic representation of the elastic recoil of the aorta. Hope this helps.
When the aortic semilunar valve snaps shut, a momentary increase in the aortic pressure results from the elastic recoil of the aorta after valve closure.
think about a tube with a rubber lid as the lid is pushed inside the pressure inside the tube will momentarily go up its the same principle as the aortic valve snaps shut there is a momentary rise in pressure in the aorta
Notch
Well a V-notch gives better accurate results when compared to rectangular notch.