This was an arbitrary decision made by anatomists many centuries ago. It is based on the "anatomical position". This was made so each would know what the other was speaking about.
frontal plane or coronal plane
The plane that divides the body into front and back halves is called the frontal or coronal plane. This plane runs vertically from side to side, creating a front section (anterior) and a back section (posterior).
One plane that divides into front and back is the sagittal plane, which runs from front to back and divides the body into left and right halves. Another plane is the frontal (coronal) plane, which divides the body into front and back portions.
The body is divided into anterior (front) and posterior (back) portions by the frontal (coronal) plane. This plane runs vertically from side to side and divides the body into front and back halves.
The plane of movement that splits the body into left and right halves is called the sagittal plane. It runs vertically from front to back and divides the body into symmetrical halves. Movements in this plane include flexion and extension, such as bending or straightening the limbs.
Coronal plane is a medical term. It is an imaginary line that slices the body in half cutting the body into front and back halves.
That would be called a transverse section.
The line that divides the body into two equal parts is called the sagittal plane. It runs vertically from the front to the back of the body, creating left and right halves. When it specifically divides the body into two equal halves, it is referred to as the midsagittal or median plane.
The three main anatomical axes in the body are the sagittal axis (divides the body into left and right halves), the transverse axis (divides the body into top and bottom halves), and the frontal axis (divides the body into front and back halves).
To cut a cadaver into equal left and right halves, you would make a sagittal cut along the midline of the body, which runs vertically from the front to the back. This cut divides the body into symmetrical left and right sections. It's important to ensure that the cut is made along the median plane for the halves to be equal.
The plane that passes through the body from front to back, dividing it into right and left sides, is called the sagittal plane. It runs vertically and can be further classified into the midsagittal plane (which divides the body into equal right and left halves) and parasagittal planes (which divide it into unequal parts).
A vertical field running through the body from front to back that divides the body into unequal left and right sides is called the parasagittal plane. This plane runs parallel to the sagittal plane, which divides the body into equal left and right halves. The parasagittal plane can vary in position, creating different asymmetrical divisions of the body.