Multi-dimensional Human Embryo, Stage 23 Samples

About Carnegie Stage 23
Most embryos at stage 23 are approximately 56-57 postovulatory days old and measure 23-32 mm in length. Distinguishing criteria for this stage include fusion of the eyelids at the medial and lateral margins, clear distinction of the subdivisions of the upper and lower limbs, the forearms appear at or above the level of the shoulders, the superficial vascular plexus of the head is very close to the vertex, and the external genitalia are well developed but not always sufficiently to distinguish the embryo's sex. N OTE: This specimen is late stage 23 or possibly an early fetus. An example representing stage 23 more accurately will replace this specimen when available.

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