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Tubules and vesicles of SER in thin dendritic spines of the adult hippocampus (CA1). a, Cistern of SER (arrowhead) entering from the dendritic shaft into a short spine with a thin neck and ending at a free vesicle of SER (arrow) in the spine head. b, Cistern of SER (arrowhead) in the neck of a thin spine and free smooth vesicle (arrow) in the spine head.c, Thin tubule of SER (arrowhead) ending in a flat cistern (open arrow) in the spine head. Scale bar (shown in c): 1.0 μm.
