| NOUN | body | fetal membrane | any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus |
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| Meaning | Any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus. | |
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| Parts | amnion, amniotic sac, amnios | Thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) |
| chorion | The outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) | |
| Narrower | allantois | The vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) |
| caul, veil, embryonic membrane | The inner membrane of embryos in higher vertebrates (especially when covering the head at birth) | |
| umbilical cord, umbilical | membranous duct connecting the fetus with the placenta | |
| Broader | membrane, tissue layer | A pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants |
| Spanish | membrana fetal, mesenterio, redaño | |
| Catalan | membrana fetal, mesenteri | |
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