In reference to vertebrae, what does C4 indicate?

The term C4 specifically designates the fourth cervical vertebra in the equine vertebral column. In the nomenclature used to identify vertebrae, "C" refers to the cervical region, which is the set of vertebrae located in the neck area of an animal. These cervical vertebrae are numbered sequentially, starting from C1 for the first cervical vertebra, C2 for the second, and so on. Therefore, C4 indicates the fourth in this series.

Understanding this nomenclature is crucial for individuals studying equine anatomy, as each cervical vertebra plays a specific role in the structure and function of the neck, including the support of the head, movement, and protection of the spinal cord.