through use of the rapid golgi technique , four types of neurons are identified , mainly on the basis of their processes : neurons with long descending axons and thick dendrites rich in spines ( type 1 ) , neurons with long ascending axons and thin dendrites poor in spines ( type 2 ) , short-axon neurons ( type 3 ) , and microneurons ( type 4 ) .
C0027882
neurons
C0004461
axon