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Volume 50 (1973 - 197･･･
- Issue 6 Pages 345-
- Issue 5 Pages 273-
- Issue 4 Pages 207-
- Issue 2-3 Pages 91-
- Issue 1 Pages 1-
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Volume 50, Issue 4
Displaying 1-5 of 5 articles from this issue
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Helmut Sinzinger, Wilhelm Firbas, Christel Hoyer-Volaysek, Leo Reising ...1973 Volume 50 Issue 4 Pages 207-215
Published: October 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe tibialis muscle of m ice is exposed during 5-30 minutes to ultrasound with an intensity of 1 Wicm2. Until an exposition time of 10 minutes we found a statistically significant diminution of the nuclei and their areal density. The further exposition shows a small statistically not significant influence on nuclei and their areal density.View full abstractDownload PDF (1341K) -
Tetuo Nozue1973 Volume 50 Issue 4 Pages 217-229
Published: October 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESS(1) The undifferentiated neural crest cells were recognized in the early tooth germ of the mice embryos. In the bud stage the neural crest cells were scattered in the vicinity of the cell group or cell mass in the tip of the dental epithelium and in the mesonchyme adjacent to it, and in the cap stage they were recognized arround the enamel knot in the inner enamel epithelium and in the dental papilla adjacent to it. In the early bell stage the neural crest cells of the inner enamel epithelium were scattered in the place where the cell arrangements were in disorder. (2) In the early bell stage, further, the undifferentiated neural crest cells were present in close proximity to the capillaries and outside the capillary wall in the future pulp, and the undifferentiated mesenchymal cells in the dental papilla were scattered in the neighbourhood of the basement membrane. (3) The neural crest ce l l s were scattered in the locally thickened oral epithelium and in the underlying mesenchyme, in the boundaries between the dental lamina and the underlying mesenchyme. (4) Furthermore, the neural crest cells were present in the mesenchyme under the oral epithelium composed of one or two cell layers in stage forming the dental lamina, and they were present parallel to the epithelium. Besides, they were scattered in the meenchyme along the outer enamel epithelium (including the future outer enamel epithelium) on the lateral side of the dental epithelium in the bud, cap, and the bell stages.View full abstractDownload PDF (2345K) -
Tetuo Nozue1973 Volume 50 Issue 4 Pages 231-247
Published: October 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESS(1) The degree and the r ange of the PAS reaction in the oral epithelium were different between the upper and lower oral epithelia in the stage before the dental lamina and the bud, cap and the bell stages. (2) In the bud and cap stages the areas where the PAS-positive substances were localized were present in the lateral tissues adjacent to the enamel organ on the buccal and lingual sides, and PAS-positive substances were more abundant on the buccal than on the lingual side. These localizations vanished in the bell stage. (3) The discrepancy in the distribution of t h e PAS-positive areas in the enamel organ was recognized by the difference in the mediodistal position in the individual tooth germ, except the lower enamel organ of the bud stage, and by difference between upper and lower tooth germs. (4) In the bud stage, PAS-positive substances were recognized in certain parts of the future stellate reticulum, and in the cap stage they were present in the undifferentiated stellate reticulum. In the bell stage they were recognized in the undifferentiated stellate recticulum and in the substances of the differentiated stellate reticulum. (5) The disparity in the distribution of the PAS-positive substances by the difference between the upper and lower tooth germs, in the medio-distal portion of the individual tooth germ, and by the difference in the stage was recognized in the dental papilla (including the future dental papilla).View full abstractDownload PDF (3094K) -
Tadahiko Iizuka1973 Volume 50 Issue 4 Pages 249-257
Published: October 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESS1. The prenatal developmen t of the secondary palate was studied in 225 cases of externally normal human embryos and early fetuses ranging in size from 24 to 58 mm in crown-rump length and in conception age from approximately 7 to 10 weeks.2. The complete closure of the palate w ithout including the uvula was observed in all the fetuses larger than 46 mm in crown-rump length.3. The percentage of the embryos with palate closed in each group of 2 mm per interval of crown-rump length was illustrated graphically.4. The standard stage in which the development of the hard and soft palate is accomplished, lies in 40 mm of crown-rump length and at about the end of 8 weeks of conception age.View full abstractDownload PDF (1264K) -
Tadahiko Iizuka1973 Volume 50 Issue 4 Pages 259-271
Published: October 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSIncidence of cleft lip and/or palate was grossly studied in 5,117 human embryos and 616 early fetuses at about 6 to 18 weeks of estimated conception age. The specimens were obtained from mothers whose pregnancies were interrupted by curettage or induced delivery for socioeconomical reasons. The main results are as follows: (1) The incidence of cleft lip with or without cleft palat e was 0.43 per cent and 0.81 per cent in the embryos and the early fetuses respectively. The incidence of isolated cleft palate was 0.32 per cent in the early fetuses. These values are significantly higher than those in infants reported in literatures. (2) Unilateral cleft lip was higher in frequency than the bilateral one, although the le'ft sided preponderance of the cleft as indicated in infants was not clearly found. (3) The external malformation s associated with cleft lip and/or palate were found in the 7 cases among 29 cleft specimens. The kinds of them were oligodactyly, polydactyly, syndactyly, cleft hand, myeloschisis and exencephaly.View full abstractDownload PDF (1826K)
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