. The science and practice of dental surgery. e of Sun/eons oj England.) fissure usually passes between the central andlateral incisors, i. e. between the endognathionand segments of that bone. Mall Fig. 29.—Skull at the age of five months (intra-uterine). (Museum of the Royal College oj Surgeonsoj England.) describes the development of the pre-maxillafrom one centre of ossification. The truthprobably lies between these two assertions, viz. Fig. 30.—Skull at the age of six months (intra-uterine).{Museum oj the Royal College oj Surgeons oj England.) that there are undoubtedly two
. The science and practice of dental surgery. e of Sun/eons oj England.) fissure usually passes between the central andlateral incisors, i. e. between the endognathionand segments of that bone. Mall Fig. 29.—Skull at the age of five months (intra-uterine). (Museum of the Royal College oj Surgeonsoj England.) describes the development of the pre-maxillafrom one centre of ossification. The truthprobably lies between these two assertions, viz. Fig. 30.—Skull at the age of six months (intra-uterine).{Museum oj the Royal College oj Surgeons oj England.) that there are undoubtedly two centres in somecases, but whether this is constantly so is opento discussion. There seems to be no justification for the oldview, perpetuated by Bland-Sutton (2), that there are six separate centres of ossificationhomologous with the elements of the reptihanjaw; and tlie more recent work of Fawcett (12)and Low (24) in this country, and of Bardelebenand others in Germany, seems to have shownconclusively that the mandiljle is develo])ed in. Fig. 31.—Skull at the age of seven montiis (intrauterine). Museum oj the Royal College oj Surgeonsoj England). membrane as a single element at the sixth week,but that the ossa mentalia may be developedas separate bones from a single centre of ossi-fication in the region of the sympliysis. Thisresearch has been founded on sections and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
