Fig. 2.3.07. Graphic reconstruction (i.e. manually shaded serial contour tracings) illustrating the invagination (arrow) into the myelinated axon (M). The inner oligodendroglial tongue of the myelin sheath fills this labyrinth to play a scavenger phagocytosing role in the axoplasm. (Rat, thalamic ventrobasal nucleus.) Download the high resolution image.