So the spinal cord consists of bone and cartilage and also of our neurons. Now, white matter basically means our neurons do have myelination while the gray matter have neurons that do not have myelination on their axons. So the big difference between the brain and a spinal cord is on the brain. The gray matter is found towards the outside and the white matter is found inside. For the spinal cord, our white matter is on the outside. This is the white matter.