The Nervous System

The nervous system receives, processes, and stores information and the central nervous system provides sensory information and the peripheral nervous system system provides sensory input and motor output.

The peripheral nervous system (PNS) has somatic and autonomic division while the autonomic division of the PNS has sympathetic and parasympathetic divisions.

Neurons are the communication cells of the nervous system and these generally consists of a cell body, several short extensions called dendrites, and long thin extensions called an axon.

The brain and spinal cord constitute the central nervous system and they are protected by bone, by three layers of connective tissues called meninges and by cerebral spinal fluid.

Reference:

Johnson, M. D. (2010). Human Biology: Concepts and Current Issues (5th ed.). San Francisco: Pearson Education.