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The spinal cord is the first and most essential part of the cerebrospinal system. The latter is so called because it consists of the brain and spinal cord, and because its centres are contained in the cranial and spinal cavities. The nervous ganglia composing the brain and spinal cord are massed together, and in this respect they are unlike those of the sympathetic system, which are scattered over a wide territory. The brain is one great mass occupying the cranial cavity, while the spinal corddoi:10.1056/nejm187803210981201 fatcat:oq33xvtcwzbnnmtpkuwt4doa5u