<unk>  are descriptive<unk>  to help identify relative positions or directions within a species.  While these<unk>  are standardized within specific fields of biology, they can differ dramatically from one discipline to another.
The problem in consistency of naming occurs when ambiguous<unk>  like "top" are used, which would be considered the head of a human, whereas for a flounder, the "top" would be the left or right side. In human anatomy, all naming is based on positions relative to the body in a standing (standard<unk>  position with arms at the side and thumbs out.  In veterinary anatomy, many<unk>  are given relative to the parts of the body, often in relation to the spine, which allows for consistency in<unk> nology between vertebrate species that naturally assume a variety of positions.  While the ears would be superior to (above) the shoulders in a human, this<unk> nology fails when describing the armadillo, where the shoulders are above the ears.  In veterinary<unk> nology, the ears would be cranial to (towards the head) the shoulders in the armadillo, the dog, the kangaroo, or any other vertebrate.  Similarly, while the belly is considered anterior to (in front of) the back in humans, this<unk> nology fails for the flounder, the armadillo and the dog (although it could work for the kangaroo).  In veterinary<unk> , the belly would be ventral to (towards the abdomen) in all vertebrates.  While the universal vertebrate<unk> nology used in veterinary medicine would work in human medicine, the human positional<unk>  are too well established to change.
Anatomical terms of location
Clinical site
Mechanical ventilation types of ventilators
Action potential
Position 
Visible spectrum
Molecular mass
Itch causes