Which plane divides the body into right and left sides?

The plane that divides the body into right and left sides is the sagittal plane. This anatomical plane extends vertically and runs parallel to the midline of the body, effectively separating it into two symmetrical halves: the right and the left segments.

Understanding the function of the sagittal plane is essential in various fields, including medicine, anatomy, and physical therapy, as it often serves as a reference for movement analysis and surgical planning. For example, any movement performed around this plane can involve flexion and extension, such as bending forward or straightening up.

In contrast, the frontal plane divides the body into anterior (front) and posterior (back) sections, while the transverse plane separates body parts into superior (above) and inferior (below) portions. The term cross-sectional plane can refer to any horizontal cut through the body, often synonymous with the transverse plane but without the specific implication of dividing body halves as the sagittal does. Knowing these distinctions is vital for precise communication in anatomical contexts.