1.3 shows the morphology of glial cells. Neuroglial cells, usually referred to as glial cells or glia, are quite different from nerve cells. Glial cells do not participate directly in electrical signaling. Astrocytes restricted to brain and spinal cord provide appropriate chemical environment for neuronal signaling. Oligldendrocytes also restricted to the CNS form a laminated wrapping called myelin around some axons.
Circuits process specific kinds of information.
A neural circuits is made up of a dense matrix of axons, dendrites, and their connections. Fig. in Box B, P. 12 - Review of Anatomical Terms like dorsal, ventral, etc. 1.6 lists the major parts of the NS and their functional relationship. The CNS consists of seven basic parts that are shown in Fig. 1.8 A, shows the cerebral hemisphere.