. The elements of embryology . Embryology. X]I.] THE TEETH. 421. DiAQEAM Shewing the Division of the Primitive Buccal Cavity into the Ebspiratort Section above and the TRUE Mouth below. (From Gegenbaur.) p. palatine plate of superior maxillary process; m. permanent mouth; n. posterior part of nasal passage; e. internasal septum. A palate grows inwards from each of the superior maxillary processes (Fig. 141), which, meeting in the middle line, form a horizontal septum dividing the front part of the stomodaeum into a dorsal respiratory section, containing the opening of the posterior nares, and


. The elements of embryology . Embryology. X]I.] THE TEETH. 421. DiAQEAM Shewing the Division of the Primitive Buccal Cavity into the Ebspiratort Section above and the TRUE Mouth below. (From Gegenbaur.) p. palatine plate of superior maxillary process; m. permanent mouth; n. posterior part of nasal passage; e. internasal septum. A palate grows inwards from each of the superior maxillary processes (Fig. 141), which, meeting in the middle line, form a horizontal septum dividing the front part of the stomodaeum into a dorsal respiratory section, containing the opening of the posterior nares, and a ventral cavity forming the permanent mouth. These two divisions open into a common cavity behind. This septum on the development within it of an osseous plate constitutes the hard palate. A posterior pro- longation in which no osseous plate is formed consti- tutes the soft palate. An internasal septum (Fig. 141 e) may more or less completely divide the dorsal cavity into two canals, continuous respectively with the two nasal cavities. The teeth are special products of the oral mucous membrane. They are formed from two distinct organs, viz. an epithelial cap and a connective tissue papilla,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Foster, M. (Michael), Sir, 1836-1907; Balfour, Francis M. (Francis Maitland), 1851-1882; Sedgwick, Adam, 1854-1913; Heape, Walter, 1855-1929. London ; New York : Macmillan


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Keywords: ., bookcentury1800, bookdecade1880, bookpubli, booksubjectembryology