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20 Cards in this Set
- Front
- Back
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After fertilization,the zygote undergoes rapid mitotic cell division called ___ |
CLEAVAGE |
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After cleavage the cell undergo ____________ |
BLASTULATION |
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16 cells in 3 days also called |
Morula |
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58 cells in day 4 know as? |
Early blastocyst |
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By day 3-5, early blastocyst enters the uterus for implantation This blastocyst possesses an? |
-The Inner cell mass - embryoblast -The outer cell mass called - trophoblast |
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Which gives rise to embryo, amnion and umbilical cord |
Inner cell Mass-embryoblast |
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That gives rise to placenta and chorion? |
Outer cell mass - trophoblast |
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__________ embryo stage |
2-8 weeks |
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____________ is a pre-embryonic stage |
0-2 weeks |
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_____________ fetal stage |
8weeks to birth |
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Implantation ideally happened in______________ because? |
upper superior wall- because it's rich in blood supply needed for the nutrients, excretion and oxygenation. |
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These 3 layers will form particular part of the embryo by day 15 in a process of ______________ |
Gastrulation |
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The Embryoblast differentiates into two types of cells namely |
Hypoblast Epiblas Will give signal to embryonic tage1 |
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3 Germinal layers known as? |
Ectoderm- form the brain, spinal cord, integuments Mesoderm- form the muscles, skeletal, blood and blood vessels. Endoderm- form the respiratory, digestive and urinary systems and organs such as liver and pancreas. |
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0-2 weeks |
*primitive streak appears * some body system laid down to primitive form *primitive CNS form * heart develop and begin to beat *covered with layer of the skin *limb buds form *gender determined |
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4-8 weeks |
* Very rapid cell division *More body systems laid down in primitive form *Blood is pumped around the vessels *Lower respiratory system begins * Head and facial features develop * Early movements *Visible on USD from 6 weeks |
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8-12 weeks |
* Rapid and weight gain * Eyelids fuse * Swallowing begins *External genitalia present but gender notdistinguishable. *Fingernails develop *Lanugo appears *Some primitive reflexes present |
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12-16 weeks
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* Rapid skeletal development (visible in x-rays) *Meconium present in gut *Nasal septum and palate fuse *Gender distinguishable |
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16-20 weeks |
* constant weight gain *Quickening - first movements of the fetal *Fetal heart heard on auscultation *Vernix caseosa appears *Skin cells begins to be renewed |
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20-24 weeks |
*Most organs function well *Eye complete *Periods of sleep and activity *Ear apparatus developing *Responds sound *Skin red and wrinked |
