On the other hand, orthotics are a functional device, designed to correct and optimize our foot function. Some insoles also feature an arch support, however they tend to be mostly made of soft materials. As a result, the support they provide is often too weak to have any effect.
Vertebrae and Cervical Spinal Nerves. The cervical spine (sometimes abbreviated as c-spine in the medical world) begins at the base of the skull. Seven vertebrae make up the cervical spine with eight pairs of cervical nerves. The individual cervical vertebrae are abbreviated C1, C2, C3, C4, C5, C6, and C7. The cervical nerves are also abbreviated; they are C1 through C8.
The cervical spine (the neck) has seven vertebral bodies, also called segments. The top two segments are unique: The first cervical segment (called the atlas) is a ring that does not have a vertebral body. This vertebra is named C1. The second vertebral body (called the axis), acts as a post that the first vertebral ring. Like the rest of the spine, the next five vertebral segments (named C3-C7) have three joints at each segment, including one disc in the front and paired facet joints in the back.