Axonal inclusions in the crabHemigrapsus nudus

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Abstract
Light microscopic examination of living giant axons from the walking legs ofHemigrapsus nudus revealed intra-axonal inclusions which were usually several tens of micrometers long and about 5 μm wide. The inclusions were filled with small light-scattering particles. The inclusions were shown, by thin section electron microscopy, to be composed largely (68% by volume) of mitochondria. Each inclusion was surrounded by membrane bounded spaces which are presumed to represent a part of the smooth endoplasmic reticulum. Similar inclusions were not found in the leg axons of a variety of other decapod crustaceans.