Assertion: axon | /r/HasProperty | insulated by myelin
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text: Glossary astrocyte glial cell type of the CNS that provides support for neurons and maintains the blood-brain barrier axon hillock tapering of the neuron cell body that gives rise to the axon axon segment single stretch of the axon insulated by myelin and bounded by nodes of Ranvier at either end (except for the first, which is after the initial segment, and the last, which is followed by the axon terminal) axon terminal end of the axon, where there are usually several branches extending toward the target cell axoplasm cytoplasm of an axon, which is different in composition than the cytoplasm of the neuronal cell body bipolar shape of a neuron with two processes extending from the neuron cell body—the axon and one dendrite blood-brain barrier (BBB) physiological barrier between the circulatory system and the central nervous system that establishes a privileged blood supply, restricting the flow of substances into the CNS cerebrospinal fluid (CSF) circulatory medium within the CNS that is produced by ependymal cells in the choroid plexus filtering the blood choroid plexus specialized structure containing ependymal cells that line blood capillaries and filter blood to produce CSF in the four ventricles of the brain ependymal cell glial cell type in the CNS responsible for producing cerebrospinal fluid initial segment first part of the axon as it emerges from the axon hillock, where the electrical signals known as action potentials are generated microglia glial cell type in the CNS that serves as the resident component of the immune system multipolar shape of a neuron that has multiple processes—the axon and two or more dendrites myelin sheath lipid-rich layer of insulation that surrounds an axon, formed by oligodendrocytes in the CNS and Schwann cells in the PNS; facilitates the transmission of electrical signals node of Ranvier gap between two myelinated regions of an axon, allowing for strengthening of the electrical signal as it propagates down the axon oligodendrocyte glial cell type in the CNS that provides the myelin insulation for axons in tracts satellite cell glial cell type in the PNS that provides support for neurons in the ganglia Schwann cell glial cell type in the PNS that provides the myelin insulation for axons in nerves synapse narrow junction across which a chemical signal passes from neuron to the next, initiating a new electrical signal in the target cell synaptic end bulb swelling at the end of an axon where neurotransmitter molecules are released onto a target cell across a synapse unipolar shape of a neuron which has only one process that includes both the axon and dendrite ventricle central cavity within the brain where CSF is produced and circulates