ELECTRON MICROSCOPY: CELL: Nissl bodies, Purkinje cell of cerebellum. (EM-labeled), endoplasmic reticulum; RCH/P&SG3540, cytoplasmic detail of one Purkinje cell showing two Nissl bodies, many of the polyribosomes appear to be free in the intercisternal space, monkey brain. N-Nissl bodies, G-Golgi apparatus, A-small myelinated axons