| Embryo 8155 - Stage 5a 2 | Fig. 8. Hertig and Rock, 1949. |
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| A drawing of the other half of the reconstructed ovum viewed from its external aspect. Note the irregular contour of the ovum, due to the tongues of syncytiotrophoblast invading the surrounding endometrium. The shadow of the germ disk is faintly seen within the ovum. Note the relatively prominent endometrial sinusoids, which however actually contain very little blood. | ||||
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