| Normal Membranes
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Etiology
• Not applicable
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Pathogenesis
• Not applicable,
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Epidemiology
• Not applicable
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General Gross Description
• Normally translucent gray and shiny
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General Microscopic Description
• Layer of amnionic epithelium with associated connective tissue termed mesoderm; derived from fetal ectoderm
• Separates readily (since it is held there by pressure of amniotic fluid) from underlying chorionic mesoderm which includes residual extravillous trophoblast, avascularized atretic villous remnants (chorion laeve) and decidualized endometrial stromal cells
• Maternal vessels (unoconverted spiral arteries) provide blood flow
• Formation of membranes occurs between 3rd week post conception and 16 week
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Clinical Correlation
• Not applicable
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References
• Benirschke K, Kaufmann P. Pathology of the human placenta, 3rd ed. New York: Springer-Verlag, 1995, pp. 268-271.
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| Normal Membranes
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| Synopsis by: Melinda Sanders M.D. (T88200M00100)[428]
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