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Fig. 37. Median sagittal sections of frog larvae

Marshall.

A just prior to closure of blastopore.

B just after closure of blastopore.

Legend
a, anal aperture b, blastopore e, epiphysis ec, ectoderm en, entoderm f, fore-brain g, mid-gut	h, hind-brain ht, rudiment of heart hy, hypophysis I, rudiment of liver m, mid-brain ms, mesoderm n, notocord	nc, neurenteric canal o, oral evagination p proctodaeum ph, pharynx r, rectum s, spinal cord y, yolk entoderm

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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the interpretation of developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these interpretations may not reflect our current scientific understanding. (More? Embryology History)

Bailey, F.R. and Miller, A.M. (1921). Text-Book of Embryology. New York: William Wood and Co.

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