Lecture 3-Prenatal Development_2012_OUTLINE

Lecture 3-Prenatal Development_2012_OUTLINE - Conception...

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Conception and Prenatal Development Lecture 3 January 18, 2012
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Lecture 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 & ovum; conception Usually occurs in a fallopian tube Conception
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Genetics of Fertilization Almost all human cells contain  46 chomosomes Ovum and sperm each 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 full implantation  (when the cell mass attaches to the  uterus wall) § Zygote Ø Fertilized egg Ø Dividing cells Ø Takes 3 days to go down the fallopian tube to the uterus Ø When it reaches the uterus, it becomes a blastocyst § Blastocyst  - hollow, 100-cell ball  Ø Forming layers Ø Cell mass moves down uterus and implants in wall
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Events of the Germinal Stage Ovary Fallopian tube
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Germinal Stage continued Implantation  – when the  blastocyst becomes  imbedded into the uterus  wall Only 20-33% of fertilized eggs  complete the journey from the  fallopian tube to the uterus and  implant in the uterine wall Embryonic disk  - cells on  inside – become new  organism Trophoblast  - outer layer of  cells-  will develop into life- support systems
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Germinal Stage continued Trophoblast  - continued § Amnion  - protective sac - encases organism in  amniotic fluid, provides a cushion and temperature  regulator § Placenta  - partial filter - permits food and oxygen to 
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This note was uploaded on 02/14/2012 for the course PSYCH 250 taught by Professor Ward during the Fall '08 term at University of Michigan.

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Lecture 3-Prenatal Development_2012_OUTLINE - Conception...

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