Median plane
Encyclopedia
The median plane is a Midsagittal plane which bisects the body vertically through the navel
Navel
The navel is a scar on the abdomen caused when the umbilical cord is removed from a newborn baby...

, dividing the body exactly in left and right side.
Sagittal plane is any plane parallel to the median plane.

It is one of the lines used to define the right upper quadrant of the human abdomen.

The midsternal line
Midsternal line
On the front of the thorax, one of the most important vertical lines is the midsternal line, the middle line of the sternum.It can be interpreted as a component of the median plane....

can be interpreted as a segment of the median plane.
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