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Plate I. Ten-Somite Human Embryo

Fig. 1. Reconstruction of the future brain region of the embryo viewed from above and behind. In order better to show the dark masses of neural crest material against the background they have been outlined with white dots. The asymmetry of the neural folds and the corresponding asymmetry of the cristae neuralis rostralis is to be noted. The form of the crista neuralis acoustico-facialis is well seen.

Fig. 2. The same reconstruction viewed from in front; the neural crest primordia are again outlined with a white dotted line. The crista neuralis acoustico-facialis in this view overlaps somewhat the crista neuralis post-otica, but the boundary between the two is indicated.

Fig. 3. Microphotograph of a section through the cranial part of the acoustico-facial primordium of the embryo ( x 250). The single mass of cells of this primordium lying dorsal to the neural tube and fused with it in the midline is to be noted. There is no apparent connexion between this primordium and the overlying somatic ectoderm.

Fig. 4. Microphotograph of a section at the level of the eighth somite ( x 500). Here there are no neural crest cells in the re-entrant angle between the neural and somatic ectoderm. The neural folds at this level are quite separate.



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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. (2024, March 28) Embryology BaxterBoyd1939-plate01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:BaxterBoyd1939-plate01.jpg

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