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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 5
Displaying 1-5 of 5 articles from this issue
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Haruo Matsuyama, Noriyuki Komatsu, Ryukichi Senda1973 Volume 50 Issue 5 Pages 273-293
Published: December 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe dorsolateral wall of th e telencephalon of the rat fetus was studied electron microscopically from day 13 to 22 gestation. Four developing stages can be divided. Day 13-14; the wall consists of pseudostratified columnar epithelium with a few cells localized in the marginal zone. Yet there is no obvious cytological distinction seen between both. Day 15-16; differentiation of young neurone in the marginal zone. Day 17-19; participation of fiber bundles in the intermediate zone where neurone migrates towards cortical plate. Day 20-22; active differentiation and development of glial cell series start in the subventricular zone and extend throughout wall. The capillary sprouts with mitosis are observed throughout all stages. The endothelial cell and pericyte arise from mesenchymal cord which may be main contributor of mitosis outside of the veretricular and subventricular zones. Polycystic cell of Caley and Maxwell present in the later fetal life and the day of first appearance of this cell are roughly compatible with that of the glioblast. Under pathological conditions the alteration appears to be exaggerated and cells involved increase. Apparent necrotic cellular debris and os m iophilic inclusions of various types can be found within intrinsic neuroectodermal cells in various temporal phase of differentiation and reaction, most abundant in early telencephalic formation and still present occasionally later day of gestation.View full abstractDownload PDF (5513K) -
Yoshiro Inoue, Yoshihiro Sugihara, Shoji Nakagawa, Kazuyo Shimai1973 Volume 50 Issue 5 Pages 295-305
Published: December 25, 1973
Released on J-STAGE: September 24, 2012
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Tadahiko Iizuka1973 Volume 50 Issue 5 Pages 307-315
Published: December 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESS1. The early development of the upper lip was examined in 113human embryos.2. T he great part of the upper lip is completely developed at horizon XIX (38-40 days) in almost all cases and at horizon XX (40-42 days) in all cases. 3. Although the side difference in development of the upper lip was observed during the early stage of its formation in several embryos, there found no consistency among them.View full abstractDownload PDF (1468K) -
Katsuhiro Inoue1973 Volume 50 Issue 5 Pages 317-325
Published: December 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe distribution of adrene r g ic and cholinergic nerve cells and fibers in the bursa of Fabricius in twenty one-day-old chicks was studied with acetylcholinesteras (AChE) staining and fluorescence method. The wall of the bursa of Fabricius is composed of a serous layer or a perimuscular connective tissue, a muscle, and a mucous layer. Both adrenergic and cholinergic nerve fibers showed a similar distribution in the serous layer or the perimuscular connective tissue, the muscle, and the mucous layer. However, the adrenergic and cholinergic nerve terminals were not definitely observed in the lymphatic nodule. There were large fluorescent and small intensely fluorescent cells in the ganglia of the perimuscular connective tissue and the muscle layer. It seemed that the small intensely fluorescent cells were the SIF-cells. The AChE-positive nerve cells were also present in the perimuscular connective tissue and the muscle layer.View full abstractDownload PDF (1787K) -
Golgi Study and Electron MicroscopyYoshiro Inoue, Yoshihiro Sugihara, Shoji Nakagawa, Kazuyo Shimai1973 Volume 50 Issue 5 Pages 327-343
Published: December 25, 1973
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSIn the brain of chick embryos and young chicks just after hatching the morphological changes of oligodendroglia during myelin formation were investigated with the Golgi method and the relationship between their changes in shape and myelin formation was discussed. It was inferred that an immature type of oligodendroglia sent out numerous thin processes, some tips of which might attach nearby neuronal axons, enclose them and elongate along them. The portions corresponding to the enclosing tongues was considered to be demonstrated as the various length of the tubular structures on the tips of the cytoplasmic processes by the Golgi method, since silver granules were precipitated as well in the outer and inner cytoplasmic tongue around the axon as in a cell body and cytoplasmic processes of oligodendroglia, which was demostrated by the electron microscopy of the Golgi stained materials. As the tub u lar structures became more elongated, the processes decreased in number, and as the myelin lamellae developed more densely, the tubular structures might be probably no longer silver-impregnated, to result in the characteristic silver-impregnated images of the mature oligodendroglia. From the findings of the arrangement of the tubular structures along an axon, internodal segments of a myelinated nerve fiber were apparently made by the plural oligodendroglia, and furthermore, single oligodendroglia seemed to be able to form two or more internodal segments along an axon. On the other hand, it was clear that an oligodendroglia was simultaneously associated with the formation of myelin sheaths of the plural axons (probably ten or so axons). It was presumed that the myelin lamellae developed in a spiral manner simultaneously with the elongation of the internodal length to reach the Ranvier's node, and then the spiral lamellae became much denser to complete the compact myelin sheaths.View full abstractDownload PDF (3419K)
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