Final answer:
Terminal buttons are the branches at the end of each axon that contain synaptic vesicles and allow for the transmission of signals to other cells.
Step-by-step explanation:
At the end of each axon are branches with knob-like tips called Terminal buttons. These terminal buttons contain synaptic vesicles, which house neurotransmitters that allow signals to be communicated to other cells. When an action potential reaches the axon terminal, neurotransmitter molecules are released and travel across the synaptic cleft to bind to receptors on the membrane of the other cell.