rachischisis

https://doi.org/10.1351/goldbook.11162

Failure of the neural tube to close in utero, resulting in a birth defect that leaves a fissure in the vertebral column with part of the spinal cord exposed.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 798 [Terms] [Paper]