Twinning.txt

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Author:
nedi
ID:
225119
Filename:
Twinning.txt
Updated:
2013-06-26 15:33:55
Tags:
qwe
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Description:
qwe
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  1. Dizygotic twins define
    • fertilization of ova by 2 sperm
    • same or different sex
  2. Dizygotic twins amnions and chorions
    2 amnions, 2 chorions
  3. mono zygotic twins define
    • singl sperm and ova
    • genetically identical
  4. TTTS affects?
    Identical twins who share a common monochorionic placenta
  5. TTTS issue
    • the shared placenta contains abnormal blood vessels
    • leading to unequal nutritional or oxygen needs
  6. when is twinning not possible?
    After second week
  7. describe gastrulation
    • 3rd week primitive streak migrates from caudal to cranial end.
    • creates notochord from primitive node between ecto/ endodermal layers
    • of disc
  8. Teratomas are a result of
    failure of the remnant primitive streak to regress.
  9. syrenomelia
    Mermaid, caused by abnormal migration of mesoderm
  10. VATER
    vertebral defects, anal atresia, TE fistula, Renal defects
  11. VACTERL
    VATER + Cardiovascular defects and upper limb defects
  12. neurulation
    • Cranial part of Neural tube-Brain
    • Prosencephalon-Forebrain
    • Mesencephalon-Midbrain(at flexure)
    • Rhombencephalon- HIndbrain
  13. neuropores fail to close
    • Spina Bifida
    • Anacephaly

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