Summary: Human Development - Part Iii

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Read the summary and the most important questions on Human Development - Part III

  • 23 Development of the brain - I

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  • What is the hindbrain also called, and what are the parts of the hindbrain?

    - The hindbrain is also called rhombencephalon
    - The parts of the hindbrain are:
    • Cerebellum & pons (metencephalon)
    • Medulla oblongata (myencephalon)
  • How is the midbrain also called, and what does it consist of?

    - Midbrain is also called mesencephalon
    - Midbrain consists of tectum & tegmentum (substantia nigra)
  • When does the brain development start in embryonic development?

    Around 2 weeks post-fertilization.
  • Along what is the embryonic brain segmented?

    Along the anteroposterior-axis (6 forebrain segments, 1 midbrain, 8 hindbrain)
  • What is this anterioposterior patterning determined by?

    By gradients of retinoic acid, which induces patterns of Hox gene expression
  • What is the cortex of the brain (outer layer) comprised of?

    Of clusters of neuronal cell bodies (grey matter)
  • What are the tracts in the brain comprised of, and what is their function?

    - They are white matter,
    - they connnect different parts of the brain
  • What are the gyri of the brain?

    The rims (so between two sulci)
  • When is nerve cell generation complete, and what process also happens at that time?

    - At 6 months
    - Myelinization also happens then
  • What are the position of the telencephalon and the diencephalon at 9 months?

    The telencephalon lies on top of the diencephalon.

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