Summary: Human Development - Part Iii
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Read the summary and the most important questions on Human Development - Part III
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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)
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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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