The 7th cervical vertebra belongs to the last segment of the cervical spine in a normal healthy adult. The spinous process of this segment is thick and is also the longest of all the spinous processes of the cervical spine, so the location of this cervical vertebra can be determined by body surface positioning. A person who lowers his head to the maximum degree, usually with a thin body, can observe and touch one of the largest and most obvious bony protrusion markers at the middle of the back of the neck and shoulders, which is the spinous process of the 7th cervical vertebra and the corresponding segment is the 7th cervical vertebra. For people who are fat or muscular, it is necessary to touch the spinous process above and below the adjacent spine to help determine the largest and most obvious protrusion, which is the intervertebral space of cervical vertebrae 6-7 between the protrusion and the previous protrusion, and the intervertebral space of cervical vertebrae 7-thoracic 1 below. X-ray judgment.