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Fig. 7 Model of the Pharynx

Seen from the left side and slightly in front.

The mouth is represented as a narrow transverse fissure between the forebrain and the body wall. In its roof is a slight funnel-shaped out-pushing - the commencement of the pocket of ectoderm to form the hypophysis. The mouth is separated from the pharynx by a complete buccopharyngeal membrane. The pharynx widens out rapidly behind this, and is flattened dorso-ventrally (fig.7).

There are four pairs of pharyngeal pouches, of which the third and fourth are small and pointed. The second pocket is so situated that it lies much more ventral than caudal to the first pocket. The first two pairs of pockets are elongated vertically, and come in direct contact with the external ectoderm, where it forms the bottoms of the first and second pairs of visceral clefts (fig.7).

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 20) Embryology Low 07.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Low_07.jpg

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