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Instead, communication between nerve cells occurs mainly through the release of chemical substances into the space between the axon and dendrites (Figure 5). This space is known as the synapse. When neurons communicate, a message, traveling as an electrical impulse, moves down an axon and toward the synapse.
Synapses are tiny gaps between neurons, where messages move from one neuron to another as chemical or electrical signals. The brain begins as a small group of cells in the outer layer of a developing embryo. As the cells grow and differentiate, neurons travel from a central birthplace to their final destination. Chemical signals from other cells guide neurons in forming various brain structures. Neighboring neurons make connections with each other and with distant nerve cells (via axons) to form brain circuits. These circuits control specific body functions such as sleep and speech.