What does a transverse (horizontal) plane separate?

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A transverse plane runs horizontally and slices the body into upper (superior) and lower (inferior) parts. It’s perpendicular to the body's long axis, so the division is top versus bottom rather than left–right or front–back. The left–right separation is produced by a sagittal plane, and the front–back separation by a coronal (frontal) plane. A curved slice isn’t a standard plane of section.