BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Striatum. Anatomical computer artwork of a human brain, showing the striate bodies (blue and green) in the midbrain, and the substantia nigra (black) in the brainstem. An enlargement shows the structure of a synapse (lower right) within one of the striate bodies that make up the striatum. A synapse is the junction between two nerve cells (neurons). As the electrical signal reaches the presynaptic end of a neuron it triggers the release of neurotransmitters (dots). These chemicals travel across the gap (synaptic cleft) between the two cells and initiate a nerve impulse in the postsynaptic neuron.
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