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:
“Even though I had let them choose their own socks since babyhood, I was only beginning to learn to trust their adult judgment.. . . I had a sensation very much like the moment in an airplane when you realize that even if you stop holding the plane up by gripping the arms of your seat until your knuckles show white, the plane will stay up by itself. . . . To detach myself from my children . . . I had to achieve a condition which might be called loving objectivity.”
—Anonymous Parent of Adult Children. Ourselves and Our Children, by Boston Womens Health Book Collective, ch. 5 (1978)