median plane median plane the median plane also called a mid-sagittal plane is used to describe the sagittal plane as it bisects the body vertically through the midline marked by the navel, dividing the body exactly in left and right side. the term parasagittal plane is used to refer to any plane parallel to the sagittal and median plane. median planehuman anatomy planes, with median plane in red.surface lines of the front of the thorax and abdomen.detailsidentifierslatinplanum medianumfma49450anatomical terminology it is one of the lines used to define the right upper quadrant of the human abdomen. the midsternal line can be interpreted as a segment of the median plane. median plane magnetic resonance imaging of the head. median plane ct scan of a pregnant woman. the fetus (exposed in the coronal plane) is 37 weeks of gestational age.