The Histogenesis of Sympathetic Ganglion Cells An Experimental Study*

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Abstract
The neural crest and variable portions of the neural tube have been removed bilaterally or unilaterally in a series of successive segments in chick embryos. In the absence of spinal ganglia and dorsal nerve roots, primordia of the sympathetic trunk arose in all of the segments in which ventral nerve roots were present. Neuroblasts and nerve cells which had undergone differentiation beyond the neuroblast stage could be identified in the sympathetic primordia in segments devoid of spinal ganglia and dorsal nerve roots. The derivation of sympathetic ganglion cells from the neural tube appears to be demonstrated.