What are the major divisions and subdivisions of the human nervous system?

The nervous system as a whole is divided into two subdivisions: the central nervous system (CNS) and the peripheral nervous system (PNS)

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The nervous system as a whole is divided into two subdivisions: 

Central nervous system (CNS)

Peripheral nervous system (PNS).

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !