Lecture+3 - Prenatal Development Lecture 3 Overview Goal To...

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Prenatal Development Lecture 3 January 15, 2008
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Overview Goal: To describe the events that lead from the formation of a single cell (conception) to an amazing newborn baby Stages of prenatal development Germinal, Embryonic, Fetal Focus on brain development Video Risks to fetal health
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Ovulation – The moment during a woman’s monthly cycle when the ovum (egg) is expelled from the ovary. Brief window for conception Ovum survives 24-48 hours Sperm cells survive 2- 5/6 days Fertilization: union of sperm and ovum; conception Usually occurs in a fallopian tube Conception
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Genetics of Fertilization Almost all human cells contain 46 chromosomes Ovum and sperm contain 23 Fertilized egg contains a unique set of 46 (23 from each parent)
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Stages of Prenatal Development Germinal period (0 to ~ 2 wks) - lasts from fertilization to just before the cell mass attaches to the uterus wall (implantation). Zygote Fertilized egg Dividing cells Takes 3 days to go down fallopian tube to uterus When it reaches the uterus, it becomes a blastocyst Blastocyst : hollow, 100 cell ball Forming layers Cell mass moves down uterus and implants in wall
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Events of the Germinal Stage
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Germinal Stage continued Implantation: when the blastocyst becomes imbedded into the uterus wall Embryonic disk - cells on inside, become new organism Trophoblast - outer layer of cells- will develop into life- support systems
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Trophoblast - continued Amnion - protective sac - encases organism in Placenta - partial filter, permits food and oxygen to reach organism and waste products to be carried away Umbilical cord - structure that connects placenta to developing organism through which nutrients are passed and waste is removed
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Lecture+3 - Prenatal Development Lecture 3 Overview Goal To...

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