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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