Final answer:
Chemical signaling through neurotransmitters is how the two sides of the hippocampus communicate.
Step-by-step explanation:
Neuronal communication occurs through chemical signaling at the synapses between neurons. The two sides of the hippocampus communicate through chemical signaling by neurotransmitters. Chemicals released at the axon terminals transmit signals through synapses into other neurons via the second neuron's axons. This process is called exocytosis, where neurotransmitter molecules are released from vesicles and bind to the surface of the other neuron.