In anatomy, the dorsum is the upper side of animals that typically run, fly, or swim in a horizontal position, and the back side of animals (like humans) that walk upright. In vertebrates the dorsum contains the backbone. The term dorsal refers to anatomical structures that are either situated toward or grow off that side of an animal. The opposite side of the animal is described with the terms ventrum and ventral.
Human neuroanatomy 
Dorsal (posterior) means, toward or the backside of the body; behind. For example, The heart is posterior to the breastbone. 
See also 
- "Essentials of Human Anatomy and Physiology", Elaine N. Marieb, Tenth Edition
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