Messages are sent from the axon terminals of one neuron to the dendrites of other neurons. In order for a message to be sent from one neuron to another, it must cross the synapse.
Then the synapse is a junction between the axon terminals of one neuron and the dendrites of another neuron. Messages travel in only one direction. Messages are received by the dendrites and travel through the cell body and the axon to the axon terminals. From there, they cross synapses to the dendrites of other neurons.
Thank you Mr.Atala for explain how message travel from neuron to neuron.