An experimental animal model of split cord malformation.

In this study, we examined an experimental animal model of split cord malformation (SCM) produced by the surgical induction of a fistula. In Cynopus pyrrhogaster neurulae (stage 18.5 +/- 0.5), the neural plate was incised and divided to construct a fistula that mimicked a neurenteric canal. After the procedure, the development of these embryos was examined morphologically and histologically. Following incubation, hemicords, hemicords with their own heminotochords, and dermal sinus were observed in histological sections of embryos with an induced fistula. These abnormalities varied with the length and duration of the fistula, and the induction of this fistula apparently caused the development of this anomaly. The histological findings resembled the findings in human cases. The results of this study support the hypothesis that SCM may originate from an accessory neurenteric canal. Copyright 2001 S. Karger AG, Basel