This document discusses the classification of the nervous system. It describes two main classifications: structural, based on neuron polarity as unipolar, pseudo-unipolar, bipolar, and multipolar; and functional, based on conduction direction as afferent and efferent, neurotransmitter production as cholinergic, GABAergic, glutamatergic, etc., and unique shape/function of neurons like Betz cells and Purkinje cells. The formation of nerves from neurons, fascicles, perineurium, and epineurium is also outlined.