A sagittal (also known as anteroposterior) plane is perpendicular to the ground, separating left from right. The midsagittal plane is the specific sagittal plane that is exactly in the middle of the body. The midsagittal or median plane is in the midline; i.e. it would pass through midline structures such as the navel or spine, and all other sagittal planes (also referred to as parasagittal planes) are parallel to it. Median can also refer to the midsagittal plane of other structures, such as a digit.
the midsagittal plane refers to what portion of the body
is the specific sagittal plane that is exactly in the middle of the body