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Volume 61 (1984 - 198･･･
- Issue 6 Pages 399-
- Issue 5 Pages 327-
- Issue 4 Pages 235-
- Issue 2-3 Pages 83-
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Volume 61, Issue 1
Displaying 1-5 of 5 articles from this issue
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Kumiko TANUMA1984 Volume 61 Issue 1 Pages 1-13
Published: 1984
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSInvestigations were made into changes of the maxillomandibularis, zygomaticomandibularis and superficial temporalis in human adults aged from the 30s to 100s, except for the 90s. Great changes with advance of age were found in the maxillomandibularis and superficial temporalis. The maxillomandibularis gradually came to have a tendon in the original part. In specimens of persons in their 40s, its terminal tendon elongated downwards to the attached portion of the second layer of the pars superficialis of the masseter, avoiding the terminal portion of the intermediate masseter and the tendon of the first layer of the deep masseter. The elongated tendon ceased elongation when it reached the tendon of the second layer of the superficial masseter approximately in specimens of persons in their 50s. The superficial temporalis in specimens from the 30s to 50s was sufficiently developed in its muscular substance and had a strong tendon above the zygomatic arch. However, in specimens of persons over 60 years of age, its muscular substance moved downwards and only a little could be seen slightly above the zygomatic arch or at the same level as the arch. The zygomaticomandibularis underwent fewer changes than the maxillomandibularis or superficial temporalis.View full abstractDownload PDF (2650K) -
1. A Scanning and Transmission Electron Microscopic ObservationHidekatsu MATSUMURA, Takao SETOGUTI1984 Volume 61 Issue 1 Pages 15-31
Published: 1984
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe ultrastructure of the lung in the adult salamander, Hynobius nebulosus, was studied by light microscopy, scanning and transmission electron microscopy.
The lung consisted of a pair of single air sacs, which have many septa and low ridges containing blood vessels on the internal surface. The internal epithelial cells were classified into respiratory epithelial cells (REC), ciliated cells, and mucous cells including goblet cells. Usually, the two latter were located at the internal end of the septa and at some low ridges, while REC were situated on the remaining internal surface. Mucous cells contained numerous discoid mucous granules and were observed to be transformed into goblet cells as a result of the maturation of these granules. REC also had more or less discoid mucous granules in the apical cytoplasm, and some REC contained many mucous granules as did the mucous cells. Lamellar bodies appeared not only in REC, but also sometimes in the ciliated and mucous cells. These results strongly suggest that REC in Hynobius nebulosus may combine in one cell the feature of pneumocytes with that of mucous or goblet cells.View full abstractDownload PDF (4420K) -
Toshiaki NAKAJIMA1984 Volume 61 Issue 1 Pages 33-57
Published: 1984
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe arterial vasculature in the floor region of the mouth and the submandibular region of the crab-eating monkey was studied by the acrylic plastic injection method.
1. The titled regions were found to be supplied by the hyoid branch and the sublingual artery arising from the lingual artery, and the submandibular glandular branch, the mylohyoid branch and the submental artery from the facial artery.
2. The hyoid branch supplied the mylohyoid and geniohyoid muscles.
3. The sublingual artery sent off the following branches: (1) the genioglossal branch to the genioglossus muscle, (2) the alveolingual artery to a wide area in the floor region of the mouth including several muscles, the sublingual gland and the gingiva and mucosa of the lingual side of the premolar area, (3) the sublingual papillary branch to the papilla, (4) the incisive gingival branch to the lingual gingiva of the lower incisors and canine, (5) the alveolar branch to the lower incisors, and (6) the median inferior labial artery to the lower lip and labial gingiva of the lower incisors.
4. The submandibular glandular branch of the facial artery supplied the submandibular gland.
5. The mylohyoid branch supplied the mylohyoid and digastric muscles and the lingual gingiva of the lower molars.
6. The branches of the submental artery were as follows: (1) the submandibular lymph node branch to the lymph nodes and the skin and muscles in the submandibular region, (2)the digastric branch to the digastric muscle, and (3) the gingival branch to the labial gingiva opposite the canine and lower lateral incisors.View full abstractDownload PDF (5433K) -
Susumu NAGAHAMA1984 Volume 61 Issue 1 Pages 59-67
Published: 1984
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe important of oral mucosal epithelium (gingival epithlium) in the early stage of the development of the tooth germ is well known. The epithelial cells along the margin of the gingiva that occupy the space of future development of the tooth proliferate into the deeper regions of the jaw to form the tooth germ after dividing into 3 layers. Each of these dental laminae branch halfway to proliferate and grow. This outbranchings are referred to as successional tooth laminae or tooth germs for the permanent teeth, and this sequence of events has been generally accepted without argument. In general, however, the dental laminae proliferate and invade the deeper regions of the jaw in an arch-shaped dam-like configuration over the entire structure of the upper and lower jaws. According to accepted theory, the dental laminae branching from this configuration forms each of the tooth germs.
The purpose of this investigation was to determine whether or not the early dental lamina proliferates and grows over the entire range of the jaw in an archshaped dam-like configuration, and to further determine whether or not the dental lamina of th permanent first molar is an extension of the dental lamina of the primary second molar.
The upper and lower jaws of human fetuses of 3,6,8 and 10 months of age were prepared in serial sections in both the sagittal and frontal plaes. The dental laminae between the deciduous central incisors and the deciduous canine teeth are formed each by one dental lamina. The dental lamina of the primary first molar forms the tooth germ of the primary first molar, and the dental lamina separated halfway extends posteriorly through the connective tissue beneath the epithelium, forming the tooth germ of the primary second molar from the dental lamina separated from the first deciduous molar. The original dental lamina of the primary second molar further extends posteriorly. The dental lamina from the epithelial tissue corresponding to the upper aspect of the first molar also extends into the deeper region of the jaw, uniting halfway with the posteriorly extends into the deeper region of the jaw to form the tooth germ of the first molar, whereas the other end forms the second molar after proceeding further posteriorly (centrifugally) through the connective tissue.View full abstractDownload PDF (2315K) -
Ken KOSUGI1984 Volume 61 Issue 1 Pages 69-81
Published: 1984
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSOrally administered tetracycline antibiotics have been known to deposit in mineralized tissues. Tetracycline is readily identified as yellow bands under light microscopy and as fluorescent lines in bone or dentin under the ultraviolet light of fluorescent microscopy. In addition, inhibition by tetracycline of hard tissues formation and calcification has also been demonstrated.
In observations of ground sections of human deciduous teeth in the present study, numerous yellow lines that were deposited along the incremental lines of dentin were detected. All teeth examined were free of remarkable dental caries, dental structural defects, or macroscopic discoloration.
The frequency of appearance of yellow fluorescent lines in the deciduous teeth in the present study was only 27% under light microscopic observation, but was as high as 52% in the deciduous incisors,62% in the deciduous canines, and 66% in the deciduous molars (an average of 61%), when examined under fluorescent microscopy, indicating a significantly higher frequency of tetracycline deposition than originally evident under light microscopy.
In the present study, in order to clarify nature of the yellow line within the dentin, absorption spectra were measured using a microspectrophotometer in order to measure the characteristics of the wave-length of absorbency. The wave-length characteristics of absorbency of the material deposited in the dentin were found to be identical with those of the tetracycline antibiotics (Vibramycin syrup). The former demonstrated a peak at 260-280 nm, whereas the latter peaked at 370-390 nm. Accordingly, the evidence strongly suggests that the yellow fluorescent lines identified in human dentin in the present study were due to tetracycline.
Moreover, the relationship between the fluorescent and incremental lines largely reflects the observation that tetracycline deposition appears most distinctly in the dentin. When tetracycline is incorporated into the developing dentin, a yellow fluorescent deposition line appears not only in the dentin, but also in the dentin-predentin junction. From an embryological viewpoint, the fluorescent line coincides with the fluorescent line in the enamel as well as the fluorescent line within the cementum at the junction.
These findings illustrate the synchronicity between periodic calcification and tetracycline deposition.
These findings were based primarily upon studies of deciduous teeth, similar finding have been obtained for permanent teeth (upper first premolar and lower third molars).View full abstractDownload PDF (2844K)
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