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Within the neural tube there are also controls on orientation that facilitate the development of both dorsal and ventral horns of the spinal cord. An indentation in the neural canal called the '''Sulcus limitans''' deliniates the dorsal and ventral columns such that two distinct development 'plates' are formed. The '''Alar Plate''' is dorsal and gives rise to sensory neurons whilst the '''Basal Plate''' is ventral and gives rise to motor neurons.

Within the neural tube there are also controls on orientation that facilitate the development of both dorsal and ventral horns of the spinal cord. An indentation in the neural canal called the '''Sulcus limitans''' deliniates the dorsal and ventral columns such that two distinct development 'plates' are formed. The '''Alar Plate''' is dorsal and gives rise to sensory neurons whilst the '''Basal Plate''' is ventral and gives rise to motor neurons. Both plates give rise to spinal horns from the grey matter of the spinal cord. White matter of the spinal cord arises from the outer margins of the neural tube and is stimulated to develop as axons grow into it from the brain, surrounding ganglia and other areas of the spinal cord.

The dorsal horn tissues eventually fuse allowing the formation of a 'median septum'. Ventral horn tissues expand more fully than the dorsal grey matter tissues and form a 'ventral fissure'.