Question

How is a brain injury classified?

as an injury of the peripheral nervous system
as an injury of the central nervous system
as an injury of the autonomic nervous system
as an injury of the somatic nervous system

Answer 1

As an injury of the central nervous system.

The brain (with the spinal cord) makes up the CNS. The peripheral nervous system (including somatic and autonomic divisions) consists of the nerves outside the brain and spinal cord.