What is the definition of mid-sagittal plane?

The mid-sagittal plane is defined as the plane that divides the body into equal right and left halves. This allows for bilateral symmetry and is an essential reference in anatomy, particularly in understanding the body's organization and relationships between different structures. When discussing movements or positions in relation to the mid-sagittal plane, it helps in clearly differentiating structures that are median (on the midline) from those that are lateral (away from the midline). Understanding this definition is important for any studies related to human movement, physiology, and anatomy, as it provides a foundational concept for analyzing the spatial arrangements of the body's parts.