Science Source December 28, 2009 DVD
EN_00957730_3347
An illustration of the key component of the nervous system, the neuron. Neurons have a large number of extensions called dendrites; branches of the neuron cell body that can be long, or very short to act as chemical message receivers from other neurons. The main extension here is the axon, the purpose of which is to transmit electro-chemical signals from one neuron to another neuron. Long axons are covered by a myelin sheath, a fatty substance that covers the axon and insulates it. Shown here is the connection between one neuron (center) and a foreground neuron body. At the end of the axon ending, the bouton, a synapse with the dendrite of the foreground cell is taking place. Across this synapse, very small neurotransmitters (red) cross this gap into the next neuron, creating the nervous system message transferral system.
2011-03-21
EAST NEWS
Science Source
Jim Dowdalls
bn6592
1,2MB
27cm x 35cm by 300dpi
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