close-up of a synaptic cleft, chemical synapse, synaptic vesicle, neurotransmitter

neuron communication transmission nerve signal neurons closeup chemical synapse synaptic vesicle neurotransmitter cleft anatomy receptor brain science nervous neural neurology cell axon vector network structure dendrite anatomical health diagram neuroscience impulse connection presynaptic neurone dopamine sheath myelin serotonin detailed schwann spinal neurotransmitters terminal dendrites postsynaptic vesicles ions release synaptogenesis signaling