The more plentiful cell type making up the Nervous System is the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities, which consists of at least 5 sub-types including the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities that sheath axons of some CNS neurons with a fatty substance, made up of their cell membrane, called Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities.

Of the others of this more numerous class of cells in the Nervous System:
the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities is a multipurpose cell which, among other things, provides nutrients from the blood to neurons and takes waste products in the opposite direction;
the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities are specialized immune cells;
and the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities that line the brain’s fluid spaces to form part of the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities, which reduces the likelihood of toxic substances getting from the blood into the brain.

In neurons we can generally asisgn function to certain cell parts:
inputs are generally received at the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities,
integration of all these inputs takes place at the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities;
if integration results in a message to be transmitted to the next cell, transmission occurs along the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities which, together with the rest of the neuron, is given a defined structure by the Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities;
and the relay of information to the next cell generally takes place from Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities at the highly-specific Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities and from Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities at the less spefiic Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities.

Generally neurons transmit information or commands to the next cell using Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities called Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities, which bind to special target structures, called Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities, on the recipient cell.

Finally, neurons have their cell bodies collected in discrete groups called Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities in the PNS and Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities in the CNS and their axons run together in groups called Astroctyeaxonaxon hillockBlood-Brain Barrierchemicalscytoskeletondendritesdiffuse synapsesdiscrete synapsesEpendymal cellsgangliaGliaMicrogliamyelinnerve tractsneurotransmittersnuclei or fieldsOligodendrocytesreceptorsterminalsvaricosities to contact cells at another location (including nerve cells).