Expected headings
"Associations"
"maternal use of various drugs (e.g. carbamazepine, valproic acid)"
"single gene abnormalities (e.g. Meckel-Gruber syndrome, Waadenburg syndrome)"
"The upper part of the neural tube forms the forebrain, midbrain and hindbrain. The lower part of the neural tube forms the spinal canal. Dysraphism results when the neural plate does not fuse completely in its lower section."