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Plate II. Ten-Somite Human Embryo

Fig. 5. Microphotograph of a section passing through the caudal part of the acoustico-facial primordium ( x 500). Here the primordium is seen as bilaterally symmetrical masses of cells lying dorso-lateral to the neural tube (cp. figs. l and 7). The otic placodes are well shown.

Fig. 6. Microphotograph of section at the level of the first somite ( x 500). Neural crest cells of the occipito-spinal group are to be seen in the angle between the neural tube and the somatic ectoderm.

Fig. 7. Microphotograph of a section through the cranial part of the acoustico-facial neural crest primordium ( x 500). There is an appearance here as if cells are being budded olf dorsally from the region of apposition of the neural folds to join the mass of crest cells. The neural folds are seen not to be completely fused.

Online Editor - 10 somite embryo corresponds to Carnegie stage 10 in Week 4.


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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, 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 terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Links: Text-fig 1 | Text-fig 2 | Plate 1 | Fig 1 | Fig 2 | Fig 3 | Fig 4 | Plate 2 | Fig 5 | Fig 6 | Fig 7 | Baxter and Boyd 1939 | Historic Embryology Papers | Neural Crest Development | Carnegie stage 10

Reference

Baxter JS. and Boyd JD. Observations on the neural crest of a ten-somite human embryo (1939) J Anat. 73: 318–326. PMID 17104759


Cite this page: Hill, M.A. (2018, October 20) Embryology BaxterBoyd1939-plate02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:BaxterBoyd1939-plate02.jpg

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