Fig. 1.1.2.28. Three very similar structures are compared in this image: dendritic spine apparatus (SA), perikaryal confronting cisterns (CC) – both derivates of smooth endoplasmic reticulum – and nuclear pocket (NP). Their ultrastructural characteristic looks very similar. The medium-dense amorphous material in interspaces between flattened cisterns contains particles, some of them similar to a shape and size of ribosomes or their subunits. Only a little is known about a function of the SA and as far as we know nothing about the CC and NP. Download the high resolution images: SA, CC, NP. Scale = 100 nm. (Rat, hippocampus and thalamus; human, brain tumor.)
