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Fig. 2 Notochord in region of first pair of mesodermic somites

The chorda lies in close relation with entoderm forming the roof of the intestine, and only toward its caudal termination is it quite separated of, and here lies in the mesoderm midway between the gut and the medullary plate. At its cranial commencement the chorda is at first not separated of, but appears more as a heaping up of entoderm cels in the roof of the pharynx; soon, however, it becomes more differentiated, as represented in fig.2.

Fig. 3 Notochord in caudal region

At the level of the first pair of mesodermic somites the chorda appears more as an evagination of the entoderm of the root of the gut, and this condition obtains almost to its caudal end, where it gets quite separated off from entoderm (fig.3).


Stage 11 Links: Week 4 | Somitogenesis | Placodes | Lecture - Mesoderm | Lecture - Ectoderm | Lecture - Early Vascular | Science Practical | Carnegie Embryos | Category:Carnegie Stage 11 | Next Stage 12
  Historic Papers: 1908 | 1920 | 1923 somites 20 | 1927 Heart | 1928 somites 17-23 | 1959 stage 11 | 1964 dysraphism


Week: 1 2 3 4 5 6 7 8
Carnegie stage: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23


A 13-14 somite stage embryo would be similar to a Carnegie stage 11 (23 - 26 days) Somite Number 13 - 20.


13-14 Somite Paper: Plate 1 | Plate 2 | Plate 3 | Fig 1 | Fig 2 | Fig 3 | Fig 4 | Fig 5 | Fig 6 | Fig 7 | Fig 8 | Fig 9 | Fig 10 | Fig 11 | Fig 12 | Fig 13 | Fig 14 | Fig 15


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Pages where the terms "Historic" (textbooks, papers, people, recommendations) 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, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Low A. Description of a human embryo of 13-14 mesodermic somites. (1908) J Anat Physiol. 42(3): 237-51. PMID 17232769 | PMC1289161



Cite this page: Hill, M.A. (2024, June 24) Embryology Low 02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Low_02.jpg

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