In which part of the nervous system is grey matter primarily found?

Grey matter is primarily found in the central nervous system, which includes the brain and spinal cord. This region is characterized by the presence of neuronal cell bodies, dendrites, and unmyelinated axons, which give it a grey appearance. Grey matter plays a crucial role in processing and integrating information, as it contains the neuronal circuits that enable complex functions such as muscle control, sensory perception, and cognitive abilities.

In contrast, the peripheral nervous system mainly consists of nerves and ganglia that relay messages to and from the central nervous system but does not inherently contain grey matter in significant quantities. The autonomic nervous system and somatic nervous system are divisions of the peripheral nervous system involved in involuntary control of body functions and voluntary muscle movement, respectively, also lacking significant grey matter composition compared to the central nervous system.