The surgeon cut along the sagittal plane during the open heart surgery, dividing the body vertically into right and left sides.
The sagittal plane is the plane the surgeon cut along during the open heart surgery you described. It divides the body vertically into right and left sides. In contrast, the frontal (coronal) plane separates the body into front and back portions, while the transverse plane divides the body horizontally into upper and lower portions.
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