Answer:
The sagittal plane is a vertical plane through the longitudinal axis dividing the body into left and right portions. If the animal is bisected straight down the midline, the section is called a "midsagittal" section. If the animal is sectioned away from and lateral to the midline, the section is referred to as "parasagittal". Refer link below
http://www.uoguelph.ca/zoology/devobio/210labs/planes1.htm