File:Spinal<unk>  direv.svg
File:Spinalcord trirev.svg
File:Spinalcord trirev rexedlamina.svg
File:Medulla<unk> is - tracts - English.svg
The<unk>  is a thin, tubular bundle of nerves that is an extension of the central nervous system from the brain and is enclosed in and protected by the bony vertebral column. The main function of the<unk>  is transmission of neural inputs between the periphery and the brain.
Spinal cord
Basal ganglia
Cerebral hemisphere
Cerebellum
White matter
Cerebellar hemisphere
Brain
Central nervous system