Active transmitters of sensorial, motor, and integrated (processed) signals, neurons communicate to each other and to non- neural target cells (e.g., muscles) through synapses. At a chemical synapse, the “emitting” neuron forms protrusions called synaptic boutons, which contain vesicles of neurotransmitters – chemicals that the active neuron releases upon the target cell. Neurons can release one or several (different) neurotransmitters and modulators: some are excitatory, driving activity in the postsynaptic cell, and some inhibitory – silencing the target. One neuron can release one or more neurotransmitters, at different synapses along its dendrites and axon terminals. A single neuron in the brain receives and makes trillions of synapses! Have fun with your dangling boutons and stay connected!

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