- The cell bodies of neurons are discrete groups called nuclei or gray matter. The axons of neurons connect the nuclei by travelling in bundles or tracts of white matter.
- The gray matter of the spinal cord is divided into ventral motor areas and dorsal sensory areas, with increased amounts at the level of the limb input.
- Neurons form chemical synapes with other cells. The presynaptic terminal contains vesicles with neurotransmitter.
- Glial Cells, the primary supportive cells come in a variety of subtypes. Oligodendrocytes form CNS myelin; Astrocytes provide structural frameworks.
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