Fertilization
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Fertilization & Development
19 Nov. 2008
Fertilization.ppt
1
Coitus & Sperm Transfer • 2-3 phases – Erection/engorgement: Parasympathetic reflex – Plateau – Orgasm: Sympathetic reflex • Heart rate, contractility increase (pulse & BP) • Intense pleasure • Ejaculation by male
19 Nov. 2008
Fertilization.ppt
2
Fertilization • Contact of sperm & secondary oocyte occurs in uterine tube – Sperm penetration – Oocyte completes meiosis II – Nuclear fusion
19 Nov. 2008
Fertilization.ppt
3
Fertilization • Sperm penetration • Why so many?
19 Nov. 2008
Fertilization.ppt
4
Fertilization • Oocyte completes meiosis II • Nuclear fusion – 1n + 1n 2n
19 Nov. 2008
Fertilization.ppt
5
Early Development • Cleavage in uterine tube
19 Nov. 2008
Fertilization.ppt
6
Early Development • Implantation – 6-7 days after fertilization – Trophoblast forms placenta – “Inner cell mass” forms embryo – (pp. 1118-1119) 19 Nov. 2008
Fertilization.ppt
7
Early Development • Implantation – Trophoblast forms placenta – “Inner cell mass” forms embryo
19 Nov. 2008
Fertilization.ppt
8
Early Development • Placenta – Provides large area for exchange of O2, CO2, nutrients, metabolic wastes between fetal and maternal blood
19 Nov. 2008
Fertilization.ppt
9
Pregnancy • Pregnancy lasts 39-40 weeks, – 280 days from last menstrual period – 3 trimesters
• Hormonal changes
19 Nov. 2008
Fertilization.ppt
10
Labor & Delivery • Dilation – Cervix dilates to ~ 10 cm diameter – Effacement – Descent of fetus into birth canal (“Station”)
• Expulsion • Placental stage – “afterbirth” 19 Nov. 2008
Fertilization.ppt
11
19 Nov. 2008
Fertilization.ppt
1
Coitus & Sperm Transfer • 2-3 phases – Erection/engorgement: Parasympathetic reflex – Plateau – Orgasm: Sympathetic reflex • Heart rate, contractility increase (pulse & BP) • Intense pleasure • Ejaculation by male
19 Nov. 2008
Fertilization.ppt
2
Fertilization • Contact of sperm & secondary oocyte occurs in uterine tube – Sperm penetration – Oocyte completes meiosis II – Nuclear fusion
19 Nov. 2008
Fertilization.ppt
3
Fertilization • Sperm penetration • Why so many?
19 Nov. 2008
Fertilization.ppt
4
Fertilization • Oocyte completes meiosis II • Nuclear fusion – 1n + 1n 2n
19 Nov. 2008
Fertilization.ppt
5
Early Development • Cleavage in uterine tube
19 Nov. 2008
Fertilization.ppt
6
Early Development • Implantation – 6-7 days after fertilization – Trophoblast forms placenta – “Inner cell mass” forms embryo – (pp. 1118-1119) 19 Nov. 2008
Fertilization.ppt
7
Early Development • Implantation – Trophoblast forms placenta – “Inner cell mass” forms embryo
19 Nov. 2008
Fertilization.ppt
8
Early Development • Placenta – Provides large area for exchange of O2, CO2, nutrients, metabolic wastes between fetal and maternal blood
19 Nov. 2008
Fertilization.ppt
9
Pregnancy • Pregnancy lasts 39-40 weeks, – 280 days from last menstrual period – 3 trimesters
• Hormonal changes
19 Nov. 2008
Fertilization.ppt
10
Labor & Delivery • Dilation – Cervix dilates to ~ 10 cm diameter – Effacement – Descent of fetus into birth canal (“Station”)
• Expulsion • Placental stage – “afterbirth” 19 Nov. 2008
Fertilization.ppt
11
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