What anatomical term describes a section dividing the body into left and right parts?

The anatomical term that describes a section dividing the body into left and right parts is "sagittal." This term specifically refers to a plane that runs vertically from the front to the back of the body, creating a division between the left and right sides. When the sagittal plane is exactly in the midline, it is referred to as the "midsagittal" or "median plane," resulting in equal left and right halves. This concept is fundamental in anatomy as it helps in visualizing the orientation and location of different structures in relation to each other. Understanding the sagittal plane is essential for grasping how various movements occur in the body, such as flexion and extension, which primarily happen within this plane.