The umbilical plane is the transverse plane passing through the umbilicus.
This is similar to the location of the mid-transverse plane, which is the transverse plane made through the waist, into roughly two halves: the torso, arms and head on the top, and the pelvis and legs (including hands if arms are held vertically) at the bottom. That is the plane seen in the picture.
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Famous quotes containing the word plane:
“It was the most ungrateful and unjust act ever perpetrated by a republic upon a class of citizens who had worked and sacrificed and suffered as did the women of this nation in the struggle of the Civil War only to be rewarded at its close by such unspeakable degradation as to be reduced to the plane of subjects to enfranchised slaves.”
—Anna Howard Shaw (18471919)