6. Pseudo-color scanning electron micrograph showing synaptic transmission in nerve endings. The signal propagation between neurons is accomplished by neurotransmission from the axon terminal of one neuron (pre-synapse) to dendritic spine of another neuron (post-synapse). The green in this image shows the axon terminal, while the blue and orange show the vesicles containing neurotransmitters in the nerve ending.
(Credit: Tina Carvalho)