. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 210.—Section of developing tooth germ of Amblystoma. e, epidermis; eo, enamel organ; m, Malpighian layer; me, mesenchyme; p, pulp of tooth. In the lower vertebrates there may be a separate invagination of the ectoderm for each tooth, but in the mammals there is a continuous ingrowth, the dental ridge (fig. 211) along the margin of the jaw. Later this becomes differentiated into separate enamel organs and dental papillae, the separate teeth developing much as. FIG. 211.—Model of ectodermal parts of jaw of h
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 210.—Section of developing tooth germ of Amblystoma. e, epidermis; eo, enamel organ; m, Malpighian layer; me, mesenchyme; p, pulp of tooth. In the lower vertebrates there may be a separate invagination of the ectoderm for each tooth, but in the mammals there is a continuous ingrowth, the dental ridge (fig. 211) along the margin of the jaw. Later this becomes differentiated into separate enamel organs and dental papillae, the separate teeth developing much as. FIG. 211.—Model of ectodermal parts of jaw of human embryo 40 mm. long, after Rose, showing the dental ridge with the enamel organs for the first teeth. in other groups. From the posterior side of this dental ridge there arises a continu- ous projection, the dental shelf (fig. 212) which later gives rise to the enamel organs for the second or permanent dentition (infra). The dental papilla persists throughout life as the pulp of the tooth, continuing to occupy the space (pulp cavity) in which it first 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 Kingsley, J. S. (John Sterling), 1854-1929. Philadelphia, P. Blakiston's son & co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
