k Twin foetuses, illustration Illustration of twin foetuses in utero that share a single common placenta red and chorionic sac red but separate amniotic cavities grey. These twins arise from duplication of the inner cell mass of the early embryo that develops separately into two foetuses. Among twin pregnancies this arrangement occurs in about 70 percent of cases. From Kollmann, J. 1907 Handatlas der Entwicklungsgeschichte des Menschen, vol 1, Fig. 177. G. Fischer, Jena., by MICROSCAPESCIENCE PHOTO LIBRARY Stock Photo - Afloimages
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Twin foetuses, illustration Illustration of twin foetuses in utero that share a single common placenta  red  and chorionic sac  red  but separate amniotic cavities  grey . These twins arise from duplication of the inner cell mass of the early embryo that develops separately into two foetuses. Among twin pregnancies this arrangement occurs in about 70 percent of cases. From Kollmann, J.  1907  Handatlas der Entwicklungsgeschichte des Menschen, vol 1, Fig. 177. G. Fischer, Jena., by MICROSCAPE SCIENCE PHOTO LIBRARY
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Twin foetuses, illustration

Illustration of twin foetuses in utero that share a single common placenta (red) and chorionic sac (red) but separate amniotic cavities (grey). These twins arise from duplication of the inner cell mass of the early embryo that develops separately into two foetuses. Among twin pregnancies this arrangement occurs in about 70 percent of cases. From Kollmann, J. (1907) Handatlas der Entwicklungsgeschichte des Menschen, vol 1, Fig. 177. G. Fischer, Jena., by MICROSCAPE/SCIENCE PHOTO LIBRARY

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