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Volume 79 (2002)
- Issue 6 Pages 169-
- Issue 5 Pages 129-
- Issue 4 Pages 93-
- Issue 2+3 Pages 55-
- Issue 1 Pages 1-
Predecessor
Volume 79, Issue 1
Displaying 1-6 of 6 articles from this issue
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Takashi SHIMOKAWA, Keiichi AKITA, Tatsuo SATO, Fei RU, Shuang-Qin YI, ...2002 Volume 79 Issue 1 Pages 1-10
Published: 2002
Released on J-STAGE: August 18, 2006
JOURNAL FREE ACCESSIn the present study, we investigated the structure and nerve innervation of the masseter, temporalis and zygomaticomandibularis of Suncus murinus which has no zygomatic arch. Detailed dissection of eight head halves of four S. murinus was performed. In S. murinus, small muscle bundle was observed to be adjoined with the lateral surface of the temporalis. This muscle bundle was completely separated from the masseter. Based on the positional relationships between the muscle bundle and supplying nerves, we conducted that the bundle corresponded to the zygomaticomandibularis of human described in our previous study (Shimokawa et al., 1999). In addition, some differences in the nerve distribution to the masticatory muscles were observed in S. murinus as compared with humans with respect to the following points: 1) The additional supplying branch to the masseter originated from the auriculotemporal nerve: 2) The common trunk of the masseteric nerve and the nerve to the posterior part of the temporalis penetrated the superior head of the lateral pterygoid. A possible model to account for these differences based on the positional relationships among the muscles and supplying nerves is presented.View full abstractDownload PDF (1716K) -
Yasushi MIYAUCHI, Hiroshi MORIYAMA, Noboru GOTO, Jun GOTO, Hiromitsu E ...2002 Volume 79 Issue 1 Pages 11-14
Published: 2002
Released on J-STAGE: August 18, 2006
JOURNAL FREE ACCESSWe studied morphometric nerve fiber analysis and the lateral asymmetry of the inferior alveolar nerve (IAN). Human IANs were resected at the mandibular foramen. The preparation of sections involved fixation, washing, dehydration, embedding, sectioning and staining as described in our previous reports. We estimated the average total number of myelinated axons in the right IAN to be 22,808, with an average transverse area of 37.6 μm2, an average perimeter of 23.0 μm, and average circularity ratio of 0.85, with the same measurements in the left IAN being 24,289, 33.9 μm2, 21.6 μm, and 0.86, respectively. Morphological differences between the right and left side were analyzed by applying parametric tests (unpaired t-test) to all measured items. According to these results, the IAN did not demonstrate notable lateral asymmetry in any measured item. We considered that these results were caused by using subjects with the same dentulous condition in both sides.View full abstractDownload PDF (2095K) -
Toshikazu NISHIMURA, Takashi NAKANO2002 Volume 79 Issue 1 Pages 15-23
Published: 2002
Released on J-STAGE: August 18, 2006
JOURNAL FREE ACCESSColloidal gold labeled-testosterone-bovine serum albumin conjugate (testosterone-BSA-gold) injected into the vascular system of rats is taken up by endocytosis into round spermatids. Based on observation of silver deposits indicating testosterone-BSA-gold with silver enhancement, we have suggested that testosterone-BSA-gold enters the nuclei through not only the postacrosomal nuclear envelope but also the subacrosomal nuclear envelope (SNE) via the acrosome (Nishimura and Nakano, 1997). However, it was unclear how testosterone-BSA-gold in the acrosome entered the nucleoplasm. Spermatids showing silver deposits on the subacrosomal space were observed under electron microscope without silver enhancement, to clarify the courses of translocation. In the spermatids, vesicles with the gold particles were seen in the subacrosomal space. Some of the vesicles were in contact with the SNE. A part of the outer nuclear membrane projected into the space. Furthermore, local single-bilayer nuclear membranes, which seemed to partially lack nuclear lamina, were present in the SNE. These results indicate the possibility that the vesicles mediate the transport of testosterone-BSA-gold from acrosome to nucleus, and that the vesicle membrane fuses with not only the outer nuclear membrane but also a shared bilayer in the SNE.View full abstractDownload PDF (2305K) -
The Effect of Melatonin on Morphological Changes in Liver Induced by Magnetic Field Exposure in RatsAlpaslan GÖKÇIMEN, Fehmi ÖZGÜNER, Erdal KARA&Oum ...2002 Volume 79 Issue 1 Pages 25-31
Published: 2002
Released on J-STAGE: August 18, 2006
JOURNAL FREE ACCESSIn this study, we aimed to investigate the possible effect of melatonin on morphological changes in liver induced by magnetic fields exposure.
Thirty albino young male Wistar Albino rats were used in the study. They were divided into 3 groups. Control group (C) (n: 10) received daily intraperitoneal injections of saline (0.1 ml/100 g) containing 5% ethanol for two weeks.
Only magnetic field exposed (MF) group (n: 10); only magnetic field exposed had daily intraperitoneal injections of physiologic saline (0.1 ml/100 g) containing 5% ethanol for two weeks. Magnetic field exposed and melatonin treated (MF+m) group (n: 10); melatonin was dissolved in ethanol with further dilution in physiological saline. The animals in this group were exposed magnetic fields for two weeks. The magnetic fields exposed animals had intraperitoneal single dose of 4 mg/kg melatonin (0.1 ml/100 g) at 10:00 o'clock daily for two weeks following magnetic fields exposure.
We used commercial CB handheld portable transceiver, Midland (USA) labelled, of 4 Watts, 40 channel. This channel frequency has been measured 27.17 MHz with frequency counter. According to the IRPA exposure standards; for 27 MHz, for 6 min, exposure limit is 0.2 mW/cm2. This value is for General Public. For occupational exposure limit is 1 mW/cm2. We have to consider General Public exposure limit. Therefore our limit is 0.2 mW/cm2. In other words; in this study; our exposure is always over the recommended limit. All the animals were decapitated. Liver samples were fixed in buffered neutral formalin. Paraffin sections were dyed with hematoxylen-eosin. Sections were examined under light microscopy.
In MF group; sinusoidal dilatations, mixed cell infiltrations noticed in the periportal area, necrosis and vacuoler degeneration were determined in liver samples.
However, parenchymal and stromal structures were observed to be prevented partially from effects of magnetic fields in melatonin treated group.
In conclusion, it is suggested that melatonin has a mild preventive effect on magnetic field exposed changes in liver tissue in the rats.View full abstractDownload PDF (2297K) -
J.C. ANDREO, J.A. OLIVEIRA, J.A.C. NAVARRO, D.D. ROQUE, J.S. ROQUE, R. ...2002 Volume 79 Issue 1 Pages 33-41
Published: 2002
Released on J-STAGE: August 18, 2006
JOURNAL FREE ACCESSSamples of the anterior and posterior regions of the masseter and temporal muscles and of the anterior belly of the digastric muscle of 4 adult male tufted capuchin monkeys (Cebus apella) were removed and stained with HE and submitted to the m-ATPase reaction (with alkaline and acid preincubation) and to the NADH-TR and SDH reactions. The results of the histoenzymologic reactions were similar, except for acid reversal which did not occur in fibers of the fast glycolytic (FG) type in the mandibular locomotor muscles. FG fibers had a larger area and were more frequent in all regions studied. No significant differences in frequency or area of each fiber type were detected, considering the anterior and posterior regions of the masseter and temporal muscles. The frequency of fibers of the fast oxidative glycolytic (FOG) and slow oxidative (SO) types and of FOG area differed significantly between the anterior belly of the digastric muscle and the mandibular locomotor muscle. The predominance of fast twitch (FG and FOG) fibers and the multipenniform and bipenniform internal architecture of the masseter and temporal muscles, respectively, are characteristics that permit the powerful bite typical of tufted capuchin monkeys.View full abstractDownload PDF (1700K) -
Shu-ichi SATO, Hiroshi OGUMA, Gen MURAKAMI, Seiji NORIYASU2002 Volume 79 Issue 1 Pages 43-53
Published: 2002
Released on J-STAGE: August 18, 2006
JOURNAL FREE ACCESSUsing 26 osteoligamentous lumbar vertebral columns (260 facets), we morphometrically investigated the cartilagenous joint surface, inner capsular surface and capsular thickness. We also examined whether the subcapsular pocket was present and, if present, how far it extended along the joint margin. The proportion of the inner capsular area in the total joint surface area in a facet (the capsular-joint surface ratio) was hypothesized to correspond to the potential looseness (or tightness) of the facet. The absolute data themselves seemed to be useful for better understanding of the joint morphology. However, further evaluations of the differences between segments, left/right differences, individual segmental fluctuation patterns and correlations between parameters provided a novel classification of specimens according to the hypothetical progress of joint degeneration. Criteria for the classification existed in 1) the laterality in parameters defined as more than 100% larger or smaller than the contralateral facet and 2) the drastic segmental difference in parameters over 50% larger or smaller than the adjacent segment. Consequently, three types were identified: 1) outside of the criteria in both area and thickness (-/- type, 9 of 26); 2) the criteria did not fit the area parameters but did fit the thickness parameters (-/+ type, 8); the criteria were filled in both categories of parameters (+/+ type, 9). Notably, in the +/+ types, the capsular thickness and capsular-joint surface ratio correlated significantly (p < 0.01), i.e., the hypothetical loose joint had a thick capsule. We speculated that early joint degeneration starts from the -/- type and advances via the -/+ type to the +/+ type. Considerating these results, we recommended using MR imaging for detailed identification of laterality in the capsular thickness for low-back pain patients to discriminate candidates for future severe degenerative changes of the articular cartilage in the lumbar spine.View full abstractDownload PDF (1094K)
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