Which plane lies exactly in the midline and is synonymous with sagittal?

• A. Sagittal Plane
• B. Median or Midsagittal Plane
• C. Parasagittal Plane
• D. Frontal Plane

Answer: (B)

A midsagittal plane is the plane that lies exactly along the body's midline, splitting left and right halves in equal measure. Because it sits on the midline, it’s the sagittal plane in its exact, symmetric form, which is why it’s the best answer when the prompt asks for the midline and a term synonymous with sagittal. If a sagittal plane is off the midline, it still runs front-to-back and divides left from right but not equally—these are called parasagittal planes. The frontal (coronal) plane, by contrast, divides front from back, not left from right. So the median or midsagittal plane correctly satisfies both being sagittal and lying on the midline.