Answer:
Spinal Cord
Explanation:
The spinal cord is the second part of the Central Nervous System. It is connected to the brain and is about the size of a human finger. From the brain, the spinal cord moves down the middle of the back and is surrounded and protected by the bony vertebral column. It is surrounded by a clear fluid called Cerebral Spinal Fluid (CSF), which is responsible for providing a cushion effect to protect the delicate nerve tissues against damage from banging against the inside of the vertebrae.