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Volume 60 (1983 - 198･･･
- Issue 6 Pages 389-
- Issue 5 Pages 311-
- Issue 4 Pages 195-
- Issue 2-3 Pages 73-
- Issue 1 Pages 1-
Predecessor
Volume 60, Issue 1
Displaying 1-4 of 4 articles from this issue
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Noriaki FUJITSUKA, Fumio ITO1983 Volume 60 Issue 1 Pages 1-15
Published: 1983
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSElectron microscopic studies revealed ruthenium red (RuR) to be taken up by sensory nerve terminals of the isolated frog muscle spindle, after incubation in 0.2 mM RuR for 10 min, a treatment which is known to modify the sensory response. Elevtron-dense deposits, found to contain ruthenium ions by X-ray microanalysis, occurred in the cytoplasm and mitochondria of the sensory terminals and intrafusal muscle fibers, and in the cells of the inner and outer capsules. Preincubation in 0.5 mM RuR for 10 min resulted in swelling of the sensory nerve terminals in which the distinction between cytoplasm and mitochondria was abolished. These results suggest that RuR may modify the terminal responses by modulating the intracellular ionic composition of the terminals.View full abstractDownload PDF (2073K) -
Youichi JINGUJI, Akoyoshi TAKISAWA1983 Volume 60 Issue 1 Pages 17-41
Published: 1983
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe sequence of events during the development of the mouse diaphragm was studied from gestational days(g. d) 9.25(late branchial arch period) through 12.5(cleft lip period), using graphic reconstrucitons or electron micrographs. We found that 1) Some portion of the diaphragm premuscle mass arose initially from the ventral edges of the 4th and 5th cervical somites at g. d.9.25 to 10.25(early limb bud period) and then it migrated ventrocaudally toward the transverse septum up to g. d.12.5.2) During its descent to the septum, the premuscle mass was laterally connected with the forelimb bud mesoderms. During this period of contact the cell population in the premuscle mass increased gradually. This suggests that in mice, myogenic precursor cells from forelimb mesoderms contribute to the development of the diaphragmatic muscle.3) Until g. d.12.5, by which time the premuscle mass had almost arrived at its adult position in the primitive diaphragm, myogenetically, the cellular components of the premuscle mass were present as spindle-shaped mononucleated cells. Primitive myotubes, containing myofibers exhibiting a faint z-band, initially appeared at g. d.12.5.View full abstractDownload PDF (6188K) -
Fumioki YASUZUMI, Naoki IMURA, Nobuhiko OKURA, Koichi ANDO1983 Volume 60 Issue 1 Pages 43-63
Published: 1983
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe micropylar cell in the ovarian follicle of the teleost, Plecoglossus altivelis has been studied with light and electron microscopy in order to clarify the mechanism of maintenance of its highly modified structure, and to determine the role of the cell during egg maturation. As oogenesis proceeds a monolayers of squamous follicle cells at the animal pole transform into stratified cuboidal cells in a depression in the attaching layer of the chorion. The micropylar cell assumes the contours of a mushroom and differentiates to form the cell body and the micropylar process. In the cytoplasm of cell body 10 nm filament form bundles about 1μm in diameter which encircle the upper part of nucleus. Branched bundles extend to the periphery and into the micropylar process. Well developed endoplasmic reticulum with cisternae which seem to be empty make the cell appear like a sponge. The micropylar process, which inserts into the cortex of oocyte to a depth of 1μm, contains a diplosome oriented nearly longitudinally with respect to the axis of the process. Many amorphous dotted satellites are associated with the diplosome. Microtubules extended to the periphery of the process and to the cell body. Functionally, the micropylar cell has three kinds of secretory systems. Two of them, which appear also in the follicular epithelium, are forthe production of the follicular liquid and the attaching layer. The third kind is particular to the micropylar cell and involves secretion from the tip of the micropylar process directly into the vitellus.View full abstractDownload PDF (6505K) -
Shigenori OKADA, Yoshikuni OHTA, Takaharu SHIMIZU, Masaharu NAKAMURA, ...1983 Volume 60 Issue 1 Pages 65-71
Published: 1983
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSA rare anomaly, in which the celiac artery was not present, that is, the left gastric, the splenic and the common hepatic arteries arose independently from the abdominal aorta in that order, was found in an 80-year-old Japanese female among cadavers for student dissection. Such a case was not described in Adachi's classification (1928) of the variations of the celiac artery, but seemed to belong to type V of Morita's classification (1935). This type was a rare, valuable and embryologically primitive pattern, which was suggested by Morita as typus primitivus, and has been reported a few times.View full abstractDownload PDF (1561K)
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