Cancer of the nerves, which originate in the brain or spinal cord, are uncommon. It may occur close to the brain or spinal cord, which causes the symptoms, or can occur in nerves away from the brain or spinal cord (see soft tissue sarcomas, peripheral nerve sheath tumors). Treatment is with surgery or occasionally radiation.
the nerves of the body can be divided into twelve pairs of cranial nerves, which arise from the brain and brainstem, 31-33 pairs of spinal nerves which arise from the spinal cord in segmental series (8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1-3 coccygeal). The spinal nerves emerge from the intervertebral foramina which lie along side of adjacent vertebrae. The pass laterally into the neck or trunk. A typical spinal nerve is formed by the union of a dorsal root, which arises from the dorsal aspect of the spinal cord and a ventral root which arises from the ventral aspect of the spinal cord. The dorsal root consists of sensory (afferent) fibers and contains a swelling called the dorsal root
The visual pathways of the eyes are equivalent to the co-axial cable that connects your video camera to the VCR. These nerves transmit visual information from the retina to the occipital lobe of the brain where the information is processed. During a routine eye exam an eye care professional evaluates the integrity of these nerves. Through examination brain lesions such as tumors and aneurysms can be detected in many cases.