Which divides left and right?

• A. Frontal plane
• B. Sagittal plane
• C. Transverse
• D. Coronal plane

Answer: (B)

The sagittal plane is the one that runs vertically from front to back and divides the body into left and right portions. If it passes exactly through the midline, it’s the midsagittal (or median) plane, creating equal left and right halves. If it’s offset from the midline, it’s still sagittal but yields unequal sides, called parasagittal. This is distinct from the frontal (coronal) plane, which separates front from back, and the transverse (horizontal) plane, which separates top from bottom. So the plane that divides left and right is the sagittal plane.