Which plane is most commonly used to obtain a cross-section of the body?

• A. The transverse plane divides the body into superior and inferior parts; cross-sections are most commonly taken in the transverse plane.
• B. The sagittal plane divides the body into left and right parts; cross-sections are most commonly taken in the sagittal plane.
• C. The coronal plane divides the body into anterior and posterior parts; cross-sections are most commonly taken in the coronal plane.
• D. The frontal plane divides the body into anterior and posterior parts; cross-sections are most commonly taken in the frontal plane.

Answer: (A)

The main idea here is that a cross-section is a slice of the body made perpendicular to its long axis. The most common way to obtain such a slice is with the transverse plane, which cuts the body into upper (superior) and lower (inferior) parts. This orientation yields horizontal slices that show the relationships of internal structures in a single view from top to bottom, which is why it’s the standard for cross-sectional views (often called axial in imaging).

If you think about the other planes, they cut differently: the sagittal plane splitting left from right would produce vertical slices that run along the length of the body, and the coronal/frontal plane splitting anterior from posterior would produce vertical slices that are oriented front-to-back. These orientations are valuable for other kinds of anatomical views, but they don’t provide the classic horizontal cross-sections most commonly associated with cross-sectional anatomy.