neuron parts

cell body

metabolic center of the neuron, contains organelles (except centrioles)


convey incoming messages toward the cell body


conduct nerve impulses away from the cell body

synaptic cleft

tiny gaps between axon terminals, separates neurons


protects and insulates nerve fibers and increases the transmission rate of nerve impulses, axons outside the CNS are myelinated by Schwann Cells

nodes of Ranvier

gaps or indentations in the myelin sheath

white matter

consists of dense collections of myelinated fibers

gray matter

contains mostly unmyelinated fibers and cell bodies