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Cards In This Set
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Describe what happens to the neural tube in week 4.
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It is converted from a flat disc to a cylinder which is curved at both ends.
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How does the NT bend?
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THe bending is brought about the by the early growth of somites.
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What are somites and what do they develop into?
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They are blocks of mesodermal tissue either side of the neural tube and they develop into muscle, dermis and the vertebral column.
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Who is the gut tube formed?
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By bending of the endoderm. leading to constriction of the embryo which constricts the yolk sac.
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Why does a midgut herniation occur?
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The gut tube grows at too fast a rate which cannot be contained by the embryo, which results in it being herniated between weeks 5-10.
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When can organogenesis begin.
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When the 3 germ layers are defined.
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When does the heart begin development?
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Week 3, it starts contraction about day 22 and it must function as it develops.
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List 3 things which happen in week 5.
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1. Development and differentiation of brain and facial prominences
2. Limb buds develop
3. Heart valves and septum develop
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List 6 events of week 6.
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1. Upper limb differentiation
2. Noticeable eyes due to retinal pirmentation
3. Spontaneous and reflex movement
4. Bone Ossification 5. Sex differentiation
6. Gland like lungs
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List 2 events of week 7.
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1. Further limb development
2. Roughly time of midgut herniation
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List 3 events of week 8.
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1. Digits seperated but webbed
2. Region of limbs differentiated
3. Purposeful movement
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