Prenatal Development Stage by Angelique Grasso https://padlet.com/grasange/plwvk3ctc04vj8fd en-us 2020-08-05 01:32:03 UTC 2025-03-21 00:55:36 UTC hello@padlet.com Germinal Stage grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669683980 0-2 weeks
  • shortest of the stages of the human lifespan
  • begins with fertilization and ending with implantation
]]> 2020-08-05 01:41:56 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669683980 zygote grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669689824
  • union of sperm cell and egg cell
  • contains 23 chromosomes from sperm and 23 chromosomes from ova
  • begins as a single cell but divides rapidly 
  • takes on spherical shape known as morula
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  • morula has 64 cells 
  • turns into blastocyst
    • ]]>     2020-08-05 01:58:16 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669697368     blastocyst grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669700763
  • inner mass becomes embryo 
  • outer cell becomes placenta 
  • implants itself in endometrium
    • ]]>     2020-08-05 02:02:12 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669700763     Embryonic Stage grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669702315 3-8 weeks
    •  period after implantation
    • all of the major organs and structures are formed
    • once fully formed, it expands, grows, and continues to develop 
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  • embryo is only around 2cm long by the end of this stage
  • many of the internal and external organs and systems are formed 
  • brain and spinal cord are almost complete by the end of it
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  • during this stage internal sex organs will begin to form
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  • occurs from center of body in an outward direction
  • evident in 32 and 52 days old embryo 
  • spine is predominate
    • ]]>     2020-08-05 02:16:29 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669711950     cepholocaudal development grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669713692
  • head to foot development 
  • development progressing from head through the trunk of the body to feet
    • ]]>     2020-08-05 02:18:52 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669713692     Foetal Stage grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669715668 9-40 weeks
    • significant change and growth
    •  the early body systems and structures established in the embryonic stage continue to develop.
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  • foetus measures 2.5 centimetres in length 
  • weighs about 2 grams at the beginning of this stage
  • about 50 centimetres and 3500 grams by the end
    • ]]>     2020-08-05 02:28:47 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669722260     functioning of systems grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669722468
  • systems including the lungs, digestive system, liver and kidneys are formed
  • these are functioning in the early stages of foetal development
    • ]]>     2020-08-05 02:29:02 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669722468     sex organs grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669733252
  • start taking shape and by around the 15th week
  • female foetus will have produced millions of ova, number will be reduced by the time she is born 
  • the testes of a male foetus will be producing testosterone
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  • movement occurs in almost all parts of the foetal body and becomes more noticeable
  •  reflexes such as sucking and grasping are highly responsive
  • foetus displays a breathing movement 
  • lungs are filled with amniotic fluid, not air
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  • during the second half of the foetal stage, tooth buds form in the gums
  •  the bones, which mainly consist of cartilage, also start to harden or ossify around this time
    • ]]>     2020-08-05 02:47:39 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669737080     senses grasange https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669741230
  • the senses also begin to function around 25 weeks after fertilisation
  • the foetus may respond to light, sound and touch
  • these senses become more sensitive throughout the remainder of the foetal stage
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  • organ connects developing foetus to uterine wall to allow nutrient uptake, waste elimination and gas exchange via mothers blood supply
  • expelled in third stage of labour, after baby is born
    • ]]>     2020-08-05 02:56:04 UTC https://padlet.com/grasange/plwvk3ctc04vj8fd/wish/669743365