Anterior (ventral) horn perikarya. Gray matter. Nissl stain. Pick out dendrites, and an axon hillock of a neuron. How can you tell the neuroglial cells apart? (Ans: Astrocytes have large pale nuclei; oligodendrocytes - smaller darker nuclei; microglia - smallest darkest nuclei (these are difficult to detect in normal tissue). What are Nissl bodies? Ans: Large stacks of RER with many free polysomes between the cisternae.