In anatomical terminology, a plane is an imaginary two-dimensional surface passing through the body. Anatomy commonly refers to three planes. The sagittal plane divides the body from left to right, running head-to-toe. A frontal or coronal plane divides the body from front to back and would be at a 90-degree angle from the sagittal plane. Finally, a transverse plane separates the body horizontally into an upper and lower portion, creating cross-sections. Planes do not have to divide the body evenly.

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