File:Frazer1926 fig06.jpg

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Fig. 6. Head of Embryo (10 mm)

Tracing of outlines in pharyngeal region of 10mm. pharyngeal region of 10mm embryo. I, II, III, pharyngeal arches; ent. iii, ent. iv, 3rd and 4th entodermal pouches.

The second groove persists because it is the transverse line of flexure of the neck, whereas the third groove, not very deep in the early stages, begins to get shallow very soon, so that at the 10mm. stage, for example, the arch is an upstanding structure seen from the front (fig. 6) owing to the depth of the second groove, whereas it is separated from the structures behind it by a very shallow remnant of the original third external groove. in the 12mm. stage this inequality in accentuation of the margins of the arch is even more striking, and it is evident that the hinder groove is on the point of disappearing, leaving the surface of the arch continuous with that of the adjoining area.

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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)
Links: Fig. 1. Embryo 4-9 mm | Fig. 2. Semi-schematic pharyngeal region | Fig. 3. Embryo 8 mm | Fig.4. Embryo 10 mm | Fig. 5. Embryo 12 mm | Fig. 6. Embryo 10 mm | Fig. 7. Third Arch | Fig. 8. Laranryngeal Area of Head | Plate 1. Fig.1,3,4


Frazer JE. The disappearance of the precervical sinus. (1926) J Anat. 61(1): 132-43. PMID 17104123.

Cite this page: Hill, M.A. (2024, May 24) Embryology Frazer1926 fig06.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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