Pregnancy

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Pregnancy
Ch 46b
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Human Development
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Stages of Development
Pre-Embryonic Development Fertilization Cleavage
Embryonic Development Gastrulation Organogenesi
s Fetal Development
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Fertilization
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Ovum and Sperm
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sperm head
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Fertilization
first polar body
metaphase of second meiotic division
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Fertilization
sperm pronucleus
polar bodies
oocyte pronucleus
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Cleavage
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Cleavage
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Implantation
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Embryonic Development
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Embryonic Development
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FetalDevelopment
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FetalDevelopment
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Development of Reproductive Organs
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The Placenta
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The Placenta
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6 months ultrasound
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Changes in Uterus
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Stages of Childbirth or Labor
Dilation Stage Expulsion Stage Placental Stage
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Dilation Stage
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Expulsion Stage
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Placental Stage
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Hormones Involved in Labor
Estrogen Fetal Oxytocin Placental
Prostaglandins Maternal Oxytocin Relaxin
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Fig. 46-18
Oxytocin
Estradiol

fromovaries
from fetusand mothersposterior pituitary
Induces oxytocinreceptors on uterus
Positive feedback
Stimulates uterusto contract
Stimulates placenta to make

Prostaglandins
Stimulate morecontractionsof uterus
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Mammary Gland
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Hormones Involved in Lactation
Estrogen Progesterone Prolactin Releasing
Hormone Prolactin Human Chorionic
Somatomammotropin Oxytocin
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