Nervous System The brain, the spinal cord and the nerves and fibers that extend from the spinal cord to the muscles and internal organs make up the nervous system.
(the nerves and fibers; extend; to the muscles and internal organs) (The brain, the spinal cord and the nerves and fibers; make up; the nervous system)
the nerves and fibers The brain, the spinal cord and the nerves and fibers
extend make up
to the muscles and internal organs
the nervous system