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Volume 39 (1963 - 196･･･
- Issue 5-6 Pages 191-
- Issue 4 Pages 135-
- Issue 3 Pages 39-
- Issue 1-2 Pages 1-
Predecessor
Volume 39, Issue 3
Displaying 1-4 of 4 articles from this issue
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On the Electron Dense Radial Component in the Laminated Myelin SheathRyohei Honjin, Toshiki Kosaka, Ikuo Takano, Kyoichi Hiramatsu1963 Volume 39 Issue 3 Pages 39-53
Published: 1963
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe radial components of the myelin sheath in the optic nerve and spinal cord of both the frog and mouse as well as of the optic nerve in Walleri an degeneration have been studied by electron microscopy. The materials were fixed in OsO4, embedded in methacrylate, Araldite or styrene-methacrylate, and, after sectionings, stained with Pb(OH)2, KMnO4 or PbO. The results obtained are summarized as follows:
1. The radial components in transverse sections of the myelin sheath appear as a series of small thickenings which are present in the interperiod lines of myelin lamellae and stand in several rows arranged radially across the thickness ofthe myelin sheath. The width of the thickening is about 50 Å and the extent along the interperiod line is about 60 to 90 Å. In oblique or tangential sections the radial components appear as thin dense lines running in parallel array across the thickness of the sheath.
2. The spacing of the myelin lamellae increases at the site of the radial component.
3. Most of the rows of thickenings extend throughout the thickness of the myelin sheath, while some of them extend for only a part of the sheath. Sometimes 2 or more radial components are present in a thin section of a sheath, where often they are not present on the same side of the sheath. There is found no firm site for the radial component in the myelin sheath.
4. When the glial cell cytoplasm is present at the site of radial component, there are found electron-dense small particles in the cytoplasm in extension of the rows of thickenings.
5. The radial components are present in some of the myelin sheath, never present in every sheaths. They are frequently present in the optic nerve of frogs, and are pretty found in the optic nerve of mice and the spinal cord of frogs, but they are less common in the spinal cord of mice. The fine structures of the radial components are almost same in every cases.
6. The radial components are found during the deformation stage of the myelin sheath in Wallerian degeneration without marked degenerative changes.
7. The radial components are an image of the true composition and structure of some myelin sheaths, not an artifact.View full abstractDownload PDF (3140K) -
Part I. The development of the ethmoidal region.R. K. Shrivastava1963 Volume 39 Issue 3 Pages 55-83
Published: 1963
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESS1. In the present work, the development of the ethmoidal region of Varanus bengalensis has been studied in five main development stages and four intermediate stages.
2. In Stage I,44.75 mm. whole length, the skeletal elements do not appear. The organ of Jacobson appears as a bulging on the olfactory sac.
3. In stage II,52.50 mm. w.l., the nasal septum appears in continuation with the trabecula communis. The perichondrium of the nasal septum extends dorsally on both sides. The duct of the organ of Jacobson elongates and connective tissue enters into the fold of the dome. Anterior chamber becomes differentiated. (Fig.2,3)
4. In stage III,57.20 mm. w.l., extensive condensations of the parieto-tectal, paranasal, aditus conchae, rostral wings, lamina transversalis anterior and the planum antorbitale appear. Lateral recess and the conchal zone can be clearly distinguished.
5. In stage IV,75.20 mm. w.l., the perichondrial walls are being formed round the cartilages. The bilateral rostral element taking part in the formation of the nasal capsule is distinguished. The concha appears as a continuation of the aditus conchae. Recess capsule is in the course of chondrification. Foramen epiphaniale is enclosed. Cartilage of Jacobson 's organ, lachrymal ducts and maxillary processes appear. Lateral nasal gland is represented by its duct arising from the anterior chamber. There is no foramen apicale. Paraseptal cartilages, sphenethmoid commissures and planum antorbitale are getting chondrified. Condensations of alar processes appear.
6. Intermediate stages. General growth occurs. Ventral nasal gland, with a supporting process from the parieto-tectal appears. This process is named as the“Ventral Nasal Process”to distinguish it from the“Lateral Nasal Process”supporting the duct of the lateral nasal gland.
7. Stage V,104.60 mm. w.l. The nasal capsule is fully chondrified. Three cartilaginous nodules are seen no the ventral side of the anterior cupola. Ectochoanal cartilage appears.
8. In the discussion the characteristics of the varanid ethmoidal region are pointed out and their significance is explained along with a few others. Lastly a discussion on the rostral element, taking part in the formation of the nasal capsule, follows.View full abstractDownload PDF (3967K) -
Part 1. The Common Iliac Artery and the External Iliac ArteryJunji Fujita1963 Volume 39 Issue 3 Pages 85-116
Published: 1963
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSI. A. iliaca communisThe abdominal aorta separates into the common iliac artery to each side usually at the level of the sixth lumbar vertebra. The common iliac artery frequently sends off the iliolumbar artery and usually passes in front of the lumboscral trunk and the obturator nerve.
The iliolumbar artery separates into the lumbar and iliac branches, but in rare cases each of these branches may arise independently or be absent. IL A. iliaca externa
The common iliac artery separates into the external iliac artery and the internal iliac artery generally at the level of the promontorium. The external iliac artery descends to the vicinity of the arcus inguinalis where it divides into the inferior epigastrica artery, deep external pudendal artery and the deep circumflex iliac artery.
The external iliac artery and the internal iliac artery are of about equal size.View full abstractDownload PDF (4629K) -
Katsumasa Fujikawa1963 Volume 39 Issue 3 Pages 117-125
Published: 1963
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThis research contains the data about the center of gravity in parts of human body that is useful for the analysis of human gait, above all, to indicate the locus of center of gravity of the whole human body in gait. My results show how the individual difference of the physique affects on the center of gravity in parts of human body and to what extent we can use the value of the cadaver upon living body.View full abstractDownload PDF (894K)
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