File:Bailey099.jpg

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Fig. 99. Ventral view of head of human embryo of 8 weeks

His.


Associated text

"Further development consists essentially of fusions between the various elements already present and of changes in the relative proportions of these elements. The two medial nasal processes come close together to form a single medial process which gives rise to the middle portion of the upper lip and the adjacent portion of the nasal septum (Figs. 98 and 99). The maxillary process expands generally to form the cheek and lateral portion of the upper lip and at the same time fuses with the nasal processes. This fusion obliterates the naso-optic furrow and shuts off the connection between the nasal pit and mouth slit (Figs. 98 and 99). Internally the concomitant formation of the palate separates the oral and nasal cavities. The lateral nasal process gives rise to the wing of the nose. The nose at first is a broad, flat structure but later becomes elevated, elongated and narrower. The lower jaw, lower lip and chin are formed by the mandibular processes. At first the chin is short vertically but broad transversely. Later it becomes longer and a transverse furrow divides the middle portion into the lower lip and chin."


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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

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.



Cite this page: Hill, M.A. (2024, February 25) Embryology Bailey099.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey099.jpg

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