LATE EVENTS IN THE MIGRATIVE BEHAVIOR OF THE RETINAL GANGLION-CELLS -A GOLGI-STUDY IN THE CHICK RETINA

The final displacement of the prospective ganglion neurons toward the ganglion cell layer (GCL) has been analyzed in chicken embryos during days 8 and 9 of incubation with the help of the Golgi method and compu ter-assisted image processing. Our findings indicate that some ganglio nar soma are still located in the inner nuclear layer (INL) while othe rs pierce the inner plexiform layer (IPL), exhibiting morphological ad aptation of their perikaryon. The changing morphology of these delayed retinal ganglion neuroblasts seems to be due to the late translocatio n of the cell perikaryon to the GCL. This late migrative displacement of the ganglionar population is discussed in relation to the presence of displaced ganglion cells of Dogiel.