Each spinal nerve is attached to the spinal cord via 2 dorsal roots and 2 ventral roots. The term "spinal nerve" actually refers to the location where these 4 roots come together outside of the...
dorsal and ventral roots.
Spinal cord is one of your main central nervous system. The other one being your brain.
mostly every nerve below the neck
This is called the "Cauda Equina".