![]() The myelin sheath has short gaps about one micrometre apart known as Nodes of Ranvier. Myelin acts as insulation to the axon and prevents messages becoming interrupted. The axon is surrounded by a sheath of fatty protein called myelin. They are collected by receptors on the dendrites of neighbouring neurons, and the message continues on its way. To cross the synapse, neurotransmitters are released at the end of the neuron. The synapse is the space between an axon and a dendrite of another neuron. Information enters the neuron via the dendrites, passes through the cell body and then along the axon until it reaches the synapse. ![]() The axon can be as long as one metre, making neurons some of the longest cells in the body. A neuron usually has a number of dendrites but only one axon, although this axon may have extensive branching. Neurons have specialised extensions called dendrites and axons. Pharmaceutical and other industry supporters.
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