Fig. 2.3.1.01. Myelinated axon. The outer (red arrrow) and inner (blue arrow) cytoplasmic tongues (loops) of the myelin-forming oligodendroglial process are clearly apparent. Axonal microtubules are marked by the small blue arrow, neurofilaments by the red one. Scale = 200 nm. (Human, epitumorous neocortex.) Download the high resolution image.