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(FRAME-INFO (STRING "Neural Crest. The neural tube is formed when the lips of the neural groove \(ectoderm\) fuse. The brain and spinal cord develop from the walls of the tube, the ventricular system from the hollow ependyma-lined cavity. Some cells from the crest of the neural groove do not participate in the fusion and end up lying alongside the neural tube: these neural crest cells migrate away from the tube and eventually form most of the neurons and glia of the peripheral nervous system.  Neural crest cells give rise to the cells of the dorsal root \(spinal\) ganglia and the primary sensory ganglia of the cranial nerves, as well as the cells of autonomic ganglia, for example, the sympathetic chain ganglia. In each lateral wall of the tube, a groove called the sulcus limitans \(not labeled\) divides the walls into an alar plate dorsally and a basal plate ventrally. In both the brainstem and spinal cord, the alar plate gives rise to sensory nuclei and the basal plate to motor nuclei."))