A sagittal plane (/ˈsædʒɪtəl/), or longitudinal plane, is an anatomical plane which divides the body into right and left parts. The plane may be in the center of the body and split it into two halves (mid-sagittal) or away from the midline and split it into unequal parts (para-sagittal).The anatomical term sagittal was coined by Gerard of Cremona.Sectional planes of the brainIdentical twins at a gestational age of 15 weeks, shown in coronal and sagittal plane, respectivelyBrain anatomy (sagittal) A sagittal plane (/ˈsædʒɪtəl/), or longitudinal plane, is an anatomical plane which divides the body into right and left parts. The plane may be in the center of the body and split it into two halves (mid-sagittal) or away from the midline and split it into unequal parts (para-sagittal).The anatomical term sagittal was coined by Gerard of Cremona.