The development of the human body; a manual of human embryology . Fig. 269.—Skull op a New-born Child and of an Adult Man, Drawnto Approximately the Same Scale.—(Henke.) regions (Fig. 269). It has been estimated that the vol-umes of the two portions have a ratio of 8: 1 in the new-born child, 4: 1 at five years of age, and 2: 1 in the adultskull (Froriep), and these differences are due principallyto changes in the vertical dimensions of the superiormaxillae. As with the increase in length, the increase nowunder consideration is, to a certain extent at least, asso-ciated with the development of
The development of the human body; a manual of human embryology . Fig. 269.—Skull op a New-born Child and of an Adult Man, Drawnto Approximately the Same Scale.—(Henke.) regions (Fig. 269). It has been estimated that the vol-umes of the two portions have a ratio of 8: 1 in the new-born child, 4: 1 at five years of age, and 2: 1 in the adultskull (Froriep), and these differences are due principallyto changes in the vertical dimensions of the superiormaxillae. As with the increase in length, the increase nowunder consideration is, to a certain extent at least, asso-ciated with the development of the teeth, these structurescalling into existence the alveolar processes which arepractically wanting in the child at birth. But a more POST-NATAL DEVELOPMENT. 513 important factor is the development in the maxillae of theantra of Highmore, the practically solid bodies of thebones becoming transformed into hollow shells. Thesecavities, together with the sinuses of the sphenoid andfrontal bones, which are also post-natal developments,seem to stand in relati
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
