The structure that divides the body into two parts is the mid sagittal plane, also known as the median plane.

Here's why:

* Sagittal plane: Any vertical plane that divides the body into right and left sections.

* Mid Sagittal plane: Specifically, the sagittal plane that runs exactly down the midline of the body, dividing it into equal right and left halves.

Let me know if you'd like to explore any other anatomical planes!