The word you're looking for is.... symmetry.
Yes, the superior plane divides the body into upper and lower halves, not right and left halves. The right and left halves are divided by the midsagittal plane.
The sagittal plane divides the body into right and left halves.
An object or organism that has left and right halves that mirror each other is said to exhibit bilateral symmetry. This is a common characteristic of many animals, including humans. It means that if an imaginary line is drawn down the center of the organism, the two halves will be nearly identical in shape and size.
Bilateral symmetry divides an organism into left and right halves.
A seal has bilateral symmetry. This means that if you cut the seal into right and left halves (called a sagittal cut), the two halves will be basically identical to each other. This is the same time of symmetry seen in humans.
The GPi has two halves that control movements on opposites sides: right controls left, left controls right.
This is called a sagittal plane if divided this way with symmetrical left and right halves. If the section produces asymmetrical halves, this is a parasagittal section.
The body is divided into equal vertical left and right halves by the sagittal plane.
The dissectional planes that divides the body into left and right equal halves are called the midsagittal plane. This answer is referenced from my dental assisting book. Keisha
The two halves of the cerebrum are the left and right hemispheres.
The midsagittal plane divides the body into identical left and right arts.
The brain has a left cerebral hemisphere and a right cerebral hemisphere, as well as a stem.