The basis for the classification of neurons into multipolar, bipolar and unipolar neurons is

The basis for the classification of neurons into multipolar, bipolar, and unipolar neurons is the number of processes of neurons. Multipolar neurons have many processes extending from the cell body, including multiple dendrites and a single axon. Bipolar neurons have two processes: one dendrite and one axon. Unipolar neurons have a single process emerging from the cell body.