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6. Which of these statements is true?
- Division of the brain usually occurs at 15 weeks
- Lobar holoprosencephaly may cause cyclopia
- Chiari malformations are caused by the reduced formation of the posterior fossa
- Alobar holoprosencephaly is the least severe form
7. Which of these statements is true?
- Spina bifida occulta often causes meningitis of infants
- Myelomeningocoele is usually unproblematic but may cause tethered cord
- In spina bifida occulta the dura is not defective
- In myelocoele the meninges are intact
8. Which of these is x-linked recessive?
- Friedrich's ataxia
- Huntington's
- Duchenne muscular dystrophy
- Dopa-responsive dystonia
9. Which of these involve deficient folding in the cerebral cortex?
- Lissencephaly
- Polymicrogyria
- Focal cortical dysplasias
- Subcortical band heterotopia
10. Which of these induces the ventral tube to form the ventral plate?
- Chordin
- Sonic hedgehog
- Neural growth factor
- Retinoic acid