Developing Ovum
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Diagram of a developing ovum, seen in longitudinal section. Labels: a, pericardium; b, bucco-pharyngeal; c, ectoderm; d, entoderm; e,placental area. f, spinal cord; i, brain; g, notochord; k, extra embryonic coelom; h, dorsal wall of alimentary canal.
Source
The Encyclopedia Britannica (New York, NY: The Encyclopedia Britannica Company, 1910)
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