Sometimes the median plane as a specific sagittal plane is included as a fourth plane. In animals with a horizontal spine the coronal plane divides the body into dorsal (towards the backbone) and ventral (towards the belly) parts and is termed the dorsal plane.

* A parasagittal plane is any plane that divides the body into left and right sections. The median plane or midsagittal plane is a specific sagittal plane; it passes through the middle of the body, dividing