Page 71 - كتاب تمريض نسا الاكتروني

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Chorionic villi

After 6 days of implantation:

-Primary villi form: strands made up of synthetism and cyto trophoblast

-Secondary villi form: primary villi invaded by mesoderm

-Tertiary villi: when blood vessels appear in mesoderm

At 12 weeks after ovulation:

-The villi related to decidua capsularis disappear and become Chorion laeve (smooth

membrane)

-The villi related to decidua basalis grow to form chorion frondosum which form

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