The units of nervous system are specialised cells called the neurons. The general structure of a neuron is as follows:
Neuron
Around the cell body are short sensory projections called the dendrons. The fine branches of dendrons are called the dendrites. These short fibres receive messages and pass them on to the cell body or the cyton. The messages from the cyton are carried away by the long axon which ends in many fine branches. The branches end in synaptic knobs. Within the axon branches are synaptic vesicles that release chemicals like adrenaline and acetylcholine into the space outside the synaptic knobs.
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