The spinal cord is the central trunk of nerves that connects the brain with the rest of the body. Each nerve root passes from the spinal column to other parts of the body through small openings bounded on one side by the disc and the other by the facets. When the spinal cord reaches the lumbar region, it splits into four bundled strands of nerve roots called the cauda equina (meaning horsetail in Latin).
Portion of the central nervous system within the vertebral canal, running from the foramen magnum to the upper part of the lumbar region, ending as the conus medullaris. image
The spinal cord is to provide a pathway for impulses traveling to and from the brain. It is a column of nerve fibers that extends from the medulla oblongata of the brain down to the level of the second lumbar vertebra.