THE STRUCTURE OF THE SCHWANN CELL AND ITS RELATION TO THE AXON IN CERTAIN INVERTEBRATE NERVE FIBERS

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Abstract
Attention is called to the existence of osmiophilic layers in, and at the surface of, the Schwann cells of lobster and squid nerve fibers, and the suggestion is made that these are of lipid-protein (myelin-like) constitution and that they manifest the optical properties described as "metatropic." Attention is called also to the highly contorted nature of the axon border of the Schwann cell and to the fact that the mitochondria of the axon (particularly in lobster fibers) are preferentially located immediately below this interface. A speculation is offered about the possible relation between the Schwann cell and certain physiological processes in the nerve fiber.