It is covered by the meninges and cushioned by cerebrospinal fluid. It connects the peripheral nervous system (outside the Brain and spinal cord) to the Brain. The spinal cord and the Brain constitute the central nervous system.

• 外覆脑膜,受脑脊液保护。连接周边神经系统(脑部和脊髓外表)和脑部,与脑部一起组成中枢神经系统。