The term dendritic tree refers to the branching out of the nerve fibers at the end of a neuron. Dendrites are the branch-like structures of neurons that extend from the cell body (the soma). The dendrites receive neural impulses (electrical and chemical signals) from the axons of other neurons.
Each of these branches that emanate from neuron has a matching branch from from another neron to create a synapse. Some of these branches can be micrometers in length.