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wood prints axon wood prints central nervous system wood prints cns wood prints dendrite wood prints hippocampus wood prints nerve cell wood prints synapse wood prints vesicle wood prints tem wood prints medical wood prints synaptic vesicle wood prints synaptic vesicles wood prints neuron wood prints human wood prints brain wood prints

photographs axon photos central nervous system photos cns photos dendrite photos hippocampus photos nerve cell photos synapse photos vesicle photos tem photos medical photos synaptic vesicle photos synaptic vesicles photos neuron photos human photos brain photos

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Excitatory synapse from the human central nervous system, transmission electron micrograph (TEM). Note the synaptic zone, synaptic vesicles and single dark dense core vesicle. Chemical synapses are specialized junctions through which nerve cells signal one another or other non-neuronal cells such as muscles. At a typical synapse an axon and a dendrite flank each other across a slender gap (synaptic cleft). Signalling molecules, known as neurotransmitters, are contained in tiny vesicles of the axon. Neurotransmitters pass rapidly from axon to dendrite triggering an electrical impulse. Neurons are (also known as nerve cells) are cells of the nervous system that are specialized to carry messages through an electrochemical process. Magnification: x3,600 when shortest axis printed at 25 millimetres.

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