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Fertilization, Pregnancy and Parturition - Physiology and Anatomy - Lecture Slides

Slides, Physiology

Post: January 26th, 2013
Description
This lecture is taken from the slides of Physiology. Key important points are: Fertilization, Pregnancy and Parturition, Fallopian Tubes, Capacitation, Female Reproductive Tract, Acrosome of Sperm, Acrosomal Reaction, Cleavage and Blastocyst Formation, Trophoblast Cells
This lecture is taken from the slides of Physiology. Key important points are: Fertilization, Pregnancy and Parturition, Fallopian Tubes, Capacitation, Female Reproductive Tract, Acrosome of Sperm, Acrosomal Reaction, Cleavage and Blastocyst Formation, Trophoblast Cells
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abhilasha

abhilasha
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Contents
Fertilization, Pregnancy, & Parturition Docsity.com 20-75 Fertilization • Normally occurs in fallopian tubes • Ejaculation produces ~300 million sperm; only 100 reach each fallopian tube • Freshly ejaculated sperm are infertile – Must spend >7hrs in female reproductive tract to be fertile • Process is called capacitation Docsity.com 20-76 Fertilization continued • Acrosome of sperm contains enzymes that digest a channel through zona pellucida to oocyte (acrosomal reaction) Docsity.com 20-77 Fertilization continued • As 1st sperm fuses with membrane of 2o oocyte, changes occur preventing another fertilization • 2o oocyte completes meiosis II, producing a mature ovum + polar body • Sperm enters ovum cytoplasm, ovum nuclear membrane disappears & diploid zygote forms Fig 20.40 Docsity.com 20-78 Cleavage and Blastocyst Formation • About 30-36 hrs after fertilization, zygote divides by mitosis (= cleavage) into 2 cells • About 50-60 hrs after fertilization, e..

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