File:Frazer1922 fig02.jpg

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Fig 2. Pharynx, 16 mm Embryo

A, dorsal aspect of recess; I and II, 1st and 2nd pouches;

B, view from outside, below, and behind, showing area of manubrial invasion, uninvaded remnant of 2nd arch, 2nd pouch, and, internal to these, the impression of the forward growth.

I have given drawings in previous papers illustrating the stages of the growth, and I need only now refer to fig. 2 as showing its definite position. The first view is of the recess in a 16 mm. embryo, seen from above: B shows the recess laterally from below and slightly from behind. The triangular area labelled as 2nd arch is the part related to Reichert’s bar, but the bar is separated from the recess, further in, by the forward growth, which therefore shows in the model as a hollow between the arch area and the pharynx.

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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 | Fig 2 | Fig 3 | Fig 4 | Fig 5 | Fig 6 | 1922 Frazer | Ernest Frazer | Historic Embryology Papers | Middle Ear Development


Frazer JE. The early formations of the middle ear and eustachian tube - a criticism. (1922) J Anat. 57(1): 18-30. PMID 17103958

Cite this page: Hill, M.A. (2024, February 28) Embryology Frazer1922 fig02.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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