To travel from the axon of one neuron to the dendrite of another neuron, a signal must cross the ... system. Glial cells provide structural and other kinds of support to neurons and help to ...

The nervous system is comprised of two primary cell types: neurons and glial cells ... greater than 0.2 μm are myelinated. In cross section, the myelinated axon appears as a nearly circular ...

For years, researchers have assumed that the signals in the brain that make mammals sleep come from neurons and that astrocytes, glial cells ... activity between cells—change in astrocytes as mice ...