A answered. Once the bacteria from a cat scratch reaches the blood stream, cat scratch disease (CSD) can spread to various parts of the body. Swollen lymph nodes closest to the scratch or bite are the most noticeable symptom. Most often these are the lymph nodes in the head, neck or upper limbs.
The upper three regions comprise the remaining 24, and are grouped under the names cervical (7 vertebrae), thoracic (12 vertebrae) and lumbar (5 vertebrae), according to the regions they occupy. Source(s): http://en.wikipedia.org/wiki/Vertebrae.
The actual process itself takes about 25 minutes. It was weird going into it, but they'll give you headphones to listen to the radio. A few knocking noises and that's about it. The worst part of doing it with a lower lumbar is that you'll be on your back for that entire time.