Horses and humans and most other animals have seven vertebrae in the neck. The cervical spine in horses can be shaped very differently.
There are some straight necks, but for the most part, the cervical vertebrae are shaped in an "S". The top curve of the "S" can be straight, wide curve, or narrow curve. The bottom curve of the "S" can be straight, wide curve, or narrow (shallow) curve. The shape of the curve can be enhanced to a small degree by the way the horse uses it's muscles, or how the rider affects the horse with contact and exercises; but the basic shape will remain the same. Judy http://iceryder.net http://clickryder.com
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