Fig. 1. Schematic diagram of a mature neuron and synapse.
A: A mature neuron has elaborate processes that are composed of multiple dendrites and one axon. Dendrites contain a large number of dendritic spines that form contacts, or synapses, with other neurons. The synapses are typically found on the dendritic shaft, located on stubby spines and filipodia. B: A neuronal synapse is the point of contact between two neurons, a presynaptic neuron and a postsynaptic neuron. It is characterized by specific synaptic proteins located on the pre- and postsynaptic sites.