Fig. 2.3.1.12. 3D reconstruction of a myelinated axon from hippocampal cortex. Axon (green) contains tubules of endoplasmic reticulum (yellow), microtubules (gray), and neurofilaments (white). Oligodendroglial inner (I) and outer (O) tongues are blue. (Rat, hippocampus.) Scale = 0.5 µm.