Ultrastructure of Two Invertebrate Synapses.

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Abstract
Electron microscope studies of a type of physiologically polarized synapse in the crayfish (Cambarus clarkii and C. virilis) and the squid (Loligo pealii) have shown that the synapse consists of a region characterized by processes of post-synaptic axoplasm lying in presynaptic Schwann cell cytoplasm. The axolemmal membrane of the post synaptic fiber completely envelops the synaptic processes and is closely applied to the corresponding axolemmal membrane of the presynaptic fiber in a manner such that a single membrane of double thickness is sometimes produced. Pre- and postsynaptic axolemmal membranes are structurally similar and are about 300 A in thickness. The axoplasm of the postsynaptic fiber and of the synaptic processes contains a distinctly increased number of axoplasmic filaments per unit volume over that of presynaptic axoplasm.

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