Fetal Membranes & Placenta

40 Pages·2009·2.54 MB·English

Fetal Membranes & Placenta
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Peking Union Medical College
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Content
Development & function of fetal
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y. membrane, including chorion,
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amnion, yolk sac, umbilical cord,
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& allantois.

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f (cid:153) Development & function of placenta
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Twins and other multiple pregnancies
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Functions of fetal membrane and placenta:
Nutrition
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Protection
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Respiration
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Endocrine
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Immunological barrier
(cid:153)
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epiblast hypoblast
exocoelomic membrane (& cavity)
amnioblasts
primary yolk sac
amnion
primitive streak
late early
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allantois
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somatic mesoderm mesoderm

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f coelom
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cytotrophoblast umbilical cord

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chorion chorionic cavity
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chorionic sac
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decidua basalis
Decidua: decidua capsularis degeneration
decidua parietalis
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FETAL MEMBRANES
I. Chorion:
extraembryonic
somatic mesoderm
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cytotrophoblast
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1. chorionic villi
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(1) primary chorionic villi:
(2) secondary chorionic villi:
(3) tertiary chorionic villi:
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