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The caudal limit of the occipitospinal neural crest (abscissa) related to the number of somitic pairs (ordinate) in 19 staged embryos. Spinal ganglia are in phase with the somites, although not with the centra (O’Rahilly and Müller, 2003). According to Orts-Llorca (1934) the sacrococcygeal ganglia (arrow) arise from the neural tube by cellular bridges rather than from typical neural crest.
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C, cervical; Co., coccygeal; L, lumbar; S, sacral; T, thoracic.
