What characteristic defines a median plane?

The median plane is defined as the vertical plane that divides the body into equal right and left halves. This anatomical plane is crucial for understanding body symmetry and organization. By splitting the body down the midline, the median plane provides a reference point for describing movements and positions of other structures relative to this central division.

Other options refer to different anatomical planes or planes of division. For example, a division into anterior (front) and posterior (back) portions corresponds to the frontal or coronal plane, while a horizontal division into upper and lower segments refers to the transverse or horizontal plane. The characteristic of running parallel to the ground also pertains to the transverse plane rather than the median plane. Understanding these distinct planes is essential in anatomy as they facilitate clear communication regarding location and movement within the body.