Human development whms2012
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  • 1. HumanDevelopmentEmbryo to Newborn
  • 2. Human DevelopmentGSE: Humans are similar to many speciesin many ways, yet unique among Earth’slife forms.Let us examine the major changes thatoccur in human development from a singlecell to birth
  • 3. First Trimester (months 1 - 3)1 month: Your baby is an embryo consisting oftwo layers of cells from which all her organs andbody parts will develop.
  • 4. 2 months: Your baby is now aboutthe size of a kidney bean and isconstantly moving. He hasdistinct, slightly webbed fingers.
  • 5. 3 months: By now your baby is about 3inches long and weighs nearly an ounce.Her tiny, unique fingerprints are now inplace
  • 6. First Trimester (months 1 - 3)1 month: Your baby is an embryo consisting oftwo layers of cells from which all her organs andbody parts will develop.2 months: Your baby is now about the size of akidney bean and is constantly moving. He hasdistinct, slightly webbed fingers.3 months: By now your baby is about 3 incheslong and weighs nearly an ounce. Her tiny,unique fingerprints are now in place
  • 7. 2 nd Trimester (months 4 - 6)Month 4: Your baby is now about 5 inches longand weighs 5 ounces. His skeleton is starting toharden from rubbery cartilage to bone.Month 5: Eyebrows and eyelids are now in place.Your baby would now be more than 10 inches longif you stretched out her legs.Month 6: Your baby weighs about a pound and ahalf. His wrinkled skin is starting to smooth outas he puts on baby fat.
  • 8. 2 Trimester nd(months 4 - 6)
  • 9. 2 nd Trimester (months 4 - 6)Month 4: Your baby is now about 5 inches longand weighs 5 ounces. His skeleton is starting toharden from rubbery cartilage to bone.Month 5: Eyebrows and eyelids are now in place.Your baby would now be more than 10 inches longif you stretched out her legs.Month 6: Your baby weighs about a pound and ahalf. His wrinkled skin is starting to smooth outas he puts on baby fat.
  • 10. 3 rd Trimester (months 7 - 9)Month 7: By now, your baby weighs about 3pounds and is more than 15 inches long. She canopen and close her eyes and follow a light.Month 8: Your baby now weighs about 4 3/4pounds. His layers of fat are filling him out,making him rounder, and his lungs are welldeveloped.Month 9: The average baby is more than 19inches long and weighs nearly 7 pounds now, butbabies vary widely in size at this stage
  • 11. Month 7: By now, your baby weighs about 3 pounds and is more than 15inches long. She can open and close her eyes and follow a light.
  • 12. Month 8: Your baby now weighs about 4 3/4pounds. His layers of fat are filling him out,making him rounder, and his lungs are well developed.
  • 13. Month 9: The average baby is morethan 19 inches long and weighs nearly 7 pounds now, but babies vary widely in size at this stage
  • 14. 3 rd Trimester (months 7 - 9)M onth 7: By now, your baby weighs about 3 pounds and is morethan 15 inches long. She can open and close her eyes and follow alight.Month 8: Your baby now weighs about 4 3/4 pounds. His layers offat are filling him out, making him rounder, and his lungs arewell developed.Month 9: The average baby is more than 19 inches long andweighs nearly 7 pounds now, but babies vary widely in size at thisstage
  • 15. Comparative Embryology Let’s compare and contrast human development to thedevelopment of other animalsThe earliest phase ofembryonic development iswhen the fertilized eggundergoes rapid cell divisionAfter early cell division, theembryo separates into threelayers, which will become allof the parts of the animals
  • 16. Comparative Embryology Compare and Contrast human development to the development of other animalsAfter the layers have completely formed, theembryo starts developing organs. Often organswill grow and then disappear, such as the tail of ahuman embryo. Also, animals will differ in termsof what organs they will form because not allanimals have the same structures. Some, forinstance, will develop wings.The beginnings of embryonic development mayoccur inside the mothers body or in eggs whichshe has laid outside her body to be fertilized,depending on the species. Embryonic developmentends when the organism transforms into a fetusor larvae, after the basic organs are formed.All embryonic development is controlled by genes