FIGURE 3.

Examples of Golgi results on neuronal and glial differentiation patterns. (A) Unpublished schema from the thesis of Bendala (1978), collecting all results on tectal cell types I and II in the context of developing tectal layer formation from Puelles and Bendala (1978). The time range covers 3–12 days of incubation. (B) Example of immature oligodendrocytes (from the chick optic tectum) displaying a small number of velamentous immature processes that are starting to envelop passing axons, revealing presumably the first step in the formation of myelin sheats (from Puelles, 1978a).