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Note:The placenta is formed as a result of contributions from the mother and the embryo.Label Key:1. elements involved in placenta formation 2. uterine wall (myometrium) 3. decidual reaction 4. inner cell mass or embryo proper 5. uterine cavity 6. inner lining of the uterine wall (endometrium) 7. trophoblast cells | ||
All ages referenced to fertilization, not last menstrual period. |