If neuronal surgeon is the one who do surgery on the nerve or spine. what does a neurologist do then.

Neurologist tells: the neurosurgeon what to cut on. Seriously....Neurology is the branch of internal medicine that deals will conditions of the brain, spinal cord and peripheral nervous system. We diagnose and manage all sorts of conditions (stroke seizure, memory loss, back pain, dizziness, MS, tremor, head injury and nerve pain to name a few). Many of us sub-specialize after additional training.

Nerve function: Neurologists are specialists in nerve function. They often do nerve studies and treat nervous system problems with medications rather than surgically. Some of the conditions treated by neurologists include migraine headaches, MS, seizure disorder, sleep disorders etc.