Your central nervous system includes the brain and the spinal cord. There's another system too- the peripheral nervous system. The central and peripheral nervous systems work together to make all parts of your body function together.
Neurons are the basic units of the nervous system.
They are similar to other cells in the body because they are surrounded by a cell membrane and have a cell nucleus suspended in a watery cytoplasm. This part of the neuron is called the cell body. Each neuron's cell body has thread-like dendrites at one end and a long axon at the other. Neurons are lined up in the body so that the axon of one cell is close to the dendrites of another. Incoming messages enter a cell through its dendrites and are carried along by electrical impulses, through the cell body and along the axon.