File:Frazer1926 fig02.jpg

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Fig. 2. Semi-schematic view of the lower aspect of the pharyngeal region

The pericardium having been removed, save for its roof. I, II, III, IV, pharyngeal arches, external; P, roof of pericardium. The whole region is somewhat flattened out to show the relations. substance of the mandibular arch, which is the only one completely joined in the middle line.

The relations between pericardium, epipericardial ridge, and outer pharynlgeal arches can be understood from fig. 2, which gives a view from below of the region after removal of the pericardial projection: the arches and in fact the whole region are represented as flattened to some extent. The pericardial roof, where it is joined to the neighbouring tissues, is retained. The epipericardial ridge on each side is indicated by interrupted lines lying between the arches and the pericardium. It is seen that, with the exception of the first, the external arches do not meet their fellows in the middle line, being separated by ridges and pericardium: it may be said at once that they never do meet their fellows in the middle line, the ridge areas and (at first) the pericardium intervening. As the pericardium acquires a more caudal position relative to the arches, the enlarged ridge-tracts come together in front of it, and a central area still separates the remnants of the regions of the arches on each side from each other.

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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, June 22) Embryology Frazer1926 fig02.jpg. Retrieved from

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