Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Neurosurgery is the medical specialty concerned with the prevention, diagnosis, treatment, and rehabilitation of disorders which affect any portion of the nervous system including the brain, spinal cord, peripheral nerves, and extra-cranial cerebrovascular system. Learn more about neurosurgery, some of the procedures used and the disorders and diseases of the nervous system it deals with in the following pages.