part_of part of part of develops_from develops from develops from has developmental contribution from has developmental contribution from immediate transformation of cavitated compound organ central nervous system spinal cord cerebrocerebellar fissure cerebro-cerebellar fissure spinal cord structure Part of the central nervous system located in the vertebral canal continuous with and caudal to the brain; demarcated from brain by plane of foramen magnum. It is composed of an inner core of gray matter in which nerve cells predominate, and an outer layer of white matter in which myelinated nerve fibers predominate, and surrounds the central canal. (CUMBO) fissura cerebro-cerebellaris SpC spinal medulla medulla spinalis fissura cerebrocerebellaris posterior neural tube spinal cord neural crest ectoderm-derived structure dorsal region element future spinal cord structure with developmental contribution from neural crest