The cells of the neural tube form three layers, a ventricular layer of undifferentiated, proliferating cells, a mantle layer of differentiating neurons that will form the gray matter of the spinal cord, and a marginal layer that contains nerve fibers and will be the white matter.

                     Species: Mouse 
                     Day Gestation: 11 
             Approx. Human Age: 6 weeks 
                                   View: Transverse Cut
                    Spinal Cord
                                      6 of 26