The spinal cord is a white, soft and cord (rope) like material running through the backbone. The internal structure of the spinal cord is much simpler and more uniform throughout its many parts than that of the brain. No matter where it is sectioned, it gives the same general appearance. The interior of the spinal cord looks grey because it is filled with neurons without having myelin sheath in their axons.
There are thirty-one pairs of peripheral spinal nerves connected to the spinal cord. The sensory spinal nerves are connected to the cord at the back or dorsal part. In fact, there are two (left and right) dorsal roots through which sensory information enter into the spinal cord. The motor spinal nerves are connected to the cord