Abstract
AbstractStructures identified as subsurface cisterns (SSC's) have been observed in a variety of nerve cells from several different species. The SSC's occurred only in neurons and were most often opposite what appeared to be glial cells. Upon acrolein‐glutaraldehyde fixation, they appeared as distinct cytoplasmic organelles consisting of a short 0.5 μ long pentalaminate membrane in close parallel to the neuronal plasmalemma on one side, and parallel to an equally long segment of endoplasmic reticulum on the other side. A direct continuity was found between this segment of endoplasmic reticulum and the nuclear membrane, suggesting that a form of communication may exist between the neuronal nucleus and the subsurface cistern. Occasionally the segment of endoplasmic reticulum was missing and in its place a mitochondrion appeared which seemed to be in direct contact with the pentalaminate membrane.
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