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Fig. 141. Ventral aspect of hard palate of human embryo of 80 mm

Kollmann's Atlas.

A very important feature in the development of the maxilla is its agency in separating the nasal cavity from the mouth cavity. The palatine process of the bone grows medially and meets and fuses with its fellow of the opposite side in the medial line, the two processes together thus constituting about the anterior three-fourths of the bony part of the hard palate. It should be observed, however, that the palatine processes do not meet at their anterior borders, for the incisive bone is insinuated between them (see Figs. 140, 141). The incisive bone is probably not derived from the maxillary process of the first visceral arch, but from the fronto-nasal process. The question thus arises as to whether it is derived from both the middle and lateral nasal processes or only from the middle. According to Kolliker's view, the lateral nasal process takes no part in the formation of the incisive bone. It is derived from the middle process, hence genetically it is a single bone on each side. According to Albrecht's view the incisive bone is genetically composed of two parts, one derived from the lateral, the other from the middle nasal process. While the matter is not one of great importance merely from the standpoint of development, it has an important bearing on the question of certain congenital malformations, e.g., hare lip, and will be discussed further under that head (p. 180).


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Reference

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



Cite this page: Hill, M.A. (2020, November 28) Embryology Bailey141.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey141.jpg

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current13:39, 18 January 2011Thumbnail for version as of 13:39, 18 January 2011761 × 323 (66 KB)S8600021 (talk | contribs)==Fig. 141. Ventral aspect of hard palate of human embryo of 80 mm== Kollmann's Atlas. {{Template:Bailey 1921 Figures}} Category:Human Category:Bone Category:Head Category:Palate