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date: 15 April 2021

Abstract and Keywords

Despite their often small numbers, the neurons in invertebrate nervous systems can nevertheless constitute many classes, and the nervous systems of little studied or entirely new species still offer significant opportunities for discovery. Circuit analyses and connectomic data are of particular significance, as are the relationships of these to behavior, and the organization of simple larval brains. Functional analyses of synaptic circuits still require knowledge of the neurotransmitter and neurotransmitter receptor for each identified neuron. Synapse complexity ranges widely; undifferentiated pathways in basal species may have unpolarized synapses with presynaptic sites opposite each other, and specialized pathways may have polyadic synapses.

Keywords: neuron, synapse, dendrite, axon, connectome, neuron size, neuron number, circuit, evolution

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