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.
There are 31 pairs of spinal nerves in humans, says Encyclopedia Brittanica. Eight pairs of these spinal nerves arise from the cervical area of the spine. Twelve pairs can be found in the thoracic area. The lumbar and sacral areas each have five pairs. The coccygeal area has one pair.