E20 to E21 Survival Archived Images-Sagittal
The following images are from a sagittally-sectioned head of an E21 rat embryo exposed to tritiated thymidine on E20–24 hr survival. Note the heavily-labeled cells just outside the germinal zones are now very sparse throughout the forebrain. These are the few postmitotic young neurons generated ON E20. Note that the banded labeling is much less prominent outside the neocortical neuroepithelium. Scattered heavily labeled cells in the brain parenchyma are most likely proliferating glia. The cerebellum continues to stands out as an immature structure in the hindbrain.