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Volume 73 (1996 - 199･･･
- Issue 6 Pages 283-
- Issue 5 Pages 219-
- Issue 4 Pages 161-
- Issue 2-3 Pages 75-
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Volume 73, Issue 4
Displaying 1-7 of 7 articles from this issue
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Zi Juan LIU, Tanenori HATAE, Takao ICHIMURA, Tetsuya ISHIDA, Takanobu ...1996 Volume 73 Issue 4 Pages 161-170
Published: October 21, 1996
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSSummary: The three-dimensional structures of myeloid bodies (MBs) in the retinal pigment epithelium (RPE) of the frog (Rana pipiens) were studied by transmission and scanning electron microscopy. MBs were observed to be an assemblies of numerous membranous lamellae that were formed by a flattened saccule of the paired membranes in the RPE. On thinsection, they appeared as lenticular, crescentic, circular and spherical forms and were associated with adjacent smooth endoplasmic reticulum (SER) and nuclear membranes. The lenticular MBs were observed to be in connection with the crescentic, circular and spherical forms. Under scanning electron microscopy, the lenticular and crescentic MBs showed a pile of disc-liked lamellae, while the circular and spherical MBs displayed an onion-liked appearance. It was noted that some tubular SER remained in the center of the circular MBs, while the lamellae were compactly arranged and filled the central region in the spherical MBs. All crescentic and spherical MBs were continuous with the lenticular and crescentic MBs. These results suggest that the lenticular MBs may be a precursor form of another variety of MBs which may be transformed into the crescentic, circular and spherical forms by the curving and fusion of the lamellar membranes at the MB's free ends.View full abstractDownload PDF (3108K) -
Chen ZHANG, Noboru GOTO, Masataka SUZUKI, Minghua KE1996 Volume 73 Issue 4 Pages 171-177
Published: October 21, 1996
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSSummary: We examined numbers and sizes of anterior horn cells (AHCs) of the human spinal cord at C6 level with aging process. Spinal cords were obtained from twenty-four male cadavers, age ranged from 41 to 97 years without any accompanying pathological changes of the spinal cord. For quantitative investigation of the AHCs, spinal cord segments were embedded in celloidin after secondary fixation and dehydration; sections (20μm thick) were stained with luxol fast blue-periodic acid-Schiff-hematoxylin and Klüver-Barrera methods; the neuronal number, the cell body area and the perimeter of AHCs in the gray matter (equivalent to the Rexed's lamina IX) were counted and measured using a combination of a microscope with a drawing tube, a digitizer and a computer at 400 times magnification. A marked reduction in number of AHCs was found in the aged subjects. Similarly, there were significantly age-related decreases in the cross-sectional area and perimeter of AHCs at C6 segment of the spinal cord. These findings indicate that the reduction in number and size of AHCs in the human spinal cord is associated with degenerative neuronal changes and loss of motoneurons during aging process.View full abstractDownload PDF (2580K) -
Shintaro KONDO, Eizo WAKATSUKI, Huang SHUN-TE, Chung SHENG-YEN, Yoshin ...1996 Volume 73 Issue 4 Pages 179-184
Published: October 21, 1996
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSSummary: The morphologic relationship of the crown structures of the maxillary second deciduous molar (m2) and the first permanent molar (M1) was investigated with odontometric methods. Materials used were 124 male dental casts taken from Chinese living in Kaohsiung (Taiwan). The mesiodistal and buccolingual diameters, cusp sizes, and intercusp distances were measured. The mean crown diameters were larger in M1 than in m2. The tooth crown proportions were similar in m2and M1. The intercusp distance was compressed buccolingually in m2. With respect to the relative cusp size, the paracone was not significantly different between m2 and M1. The metacone was relatively larger in m2 than M1, while lingual cusps (protocone and hypocone) were relatively smaller in m2 than in M1. Principal component analysis was performed to investigate factors influencing the variation in crown dimensions of the two teeth. Four components were extracted: (1) buccolingual intercusp distances, (2) crown proportion (mesiodistal and buccolingual diameters), (3) mesiobuccal and distolingual compression, and (4) protocone and mesiodistal intercusp distance. Analysis of principal component scores indicated that the crown proportions of m2 and M1 were similar. The m2 had a smaller protocone and more buccolingually compressed intercusp distances than did M11. The morphologic characteristics of the crown of m2 indicate that it is more primitive and has developed less than M1.View full abstractDownload PDF (1289K) -
Takashi NAKANO1996 Volume 73 Issue 4 Pages 185-193
Published: October 21, 1996
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSSummary: The three-dimensional architecture of the collagen fibrils in the corpus cavernosum of the crab-eating monkey was studied by scanning electron microscope, after digestion of cellular and some extracellular elements by NaOH. The tunica was made up of undulating bundles of collagen fibrils which were arranged in inner circular, middle intermingled and outer longitudinal layers. The trabecula appeared as numerous cylindrical tubes which had once accommodated individual smooth muscle fibers. The outer surface of the trabecula was covered with a sheath woven from twisting bundles of collagen fibrils. These architectural features of the collagen fibrils seem to be related to fluctuations in the diameter and shape of the corpus during erection and detumescence.View full abstractDownload PDF (2639K) -
Bo LIU, Hidekazu WAKURI, Ken-ichiro MUTOH, Kazumi TANIGUCHI1996 Volume 73 Issue 4 Pages 195-203
Published: October 21, 1996
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSSummary: The neurosecretory cells in nervous system of the Taenia hydatigena was studied light- and electronmicroscopically. On the basis of the cytological structure they were divided into two types: type I neurosecretory cells, which containing large dense-cored vesicles, small elongated mitochondria and a large amount of free ribosomes, were located mainly in the central and peripheral nervous system; type II neurosecretory cells were characterized by their moderate amount of free ribosomes, endoplasmic reticulum which contacted with the membranes of perikarya, large ovoid mitochondria, large dense-cored vesicles and their localization in the musculature near nerve profiles. The synaptic and nonsynaptic contacts i. e. omega figure and exocytosis release sites were seen in the neuropile, musculature and excretory ducts. The present findings suggest that neurosecretory cells in nervous system may play an important integrative roles of both neuronal and endocrine in the flatworm.View full abstractDownload PDF (2856K) -
Kohshi MIURA, Kiyoaki SASAKI, Hajime AMASAKI, Yutaka KANO, Masao ASARI1996 Volume 73 Issue 4 Pages 205-209
Published: October 21, 1996
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSSummary: The expression and distribution of myoepithelial cells in relation to parotid acinar cells were studied immunohistochemically in bovine fetuses and neonates. Definitive myoepithelial cells first appeared as slender, brown short lines around the perimeters of developing secretion acini at four months of fetal age (in a 26cm long fetus). At this time, parotid acinar cells possessed no distinct secretory granules in the supranuclear region. The differentiation of myoepithelial cells subsequently progressed during late gestation and birth. In neonates, the myoepithelial cells surrounded the secretory acini and parts of the intercalated ducts.View full abstractDownload PDF (1999K) -
T. NAKANO1996 Volume 73 Issue 4 Pages 211-217
Published: October 21, 1996
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESStages of keratinization. Considering the ultrastructural features, it is suggested that the epithelium lining the distal part shows more advanced keratinization than in the proximal part. Further, the width of the microridges in the distal part was about doubled compared to that in the proximal part. The difference in the width of microridges appears to be an important marker of the degree of keratinization.View full abstractDownload PDF (2918K)
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