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Volume 42 (1979)
- Issue 5 Pages 489-
- Issue 4 Pages 399-
- Issue 3 Pages 197-
- Issue 2 Pages 95-
- Issue 1 Pages 1-
Volume 42, Issue 2
Displaying 1-9 of 9 articles from this issue
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Takao SETOGUTI, Yukinori SATOU, Yoshiki GOTO1979 Volume 42 Issue 2 Pages 95-102
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSIn the adrenal cortex of old mice, lamellar bodies of various shapes frequently appear in the zona reticularis cells. These structures consist of electron dense plates, about 20nm in width, closely piled at regular distances of about 25nm. Each plate displays two sheets of unit membranes enclosing a dense material and with several clear spaces between them. These paired membranes usually terminate in round saccules at both ends, but occasionally continue to the tubules of surrounding agranular endoplasmic reticulum. Saccules in several rows, in combination with a part of the lamellae, may be arranged circularly in the cytoplasm. From these observations, it is proposed that the lamellar body is composed of a cup-shaped mass of flattened cisternae of the agranular endoplasmic reticulum and each of the cisternae is attenuated and closed except at their marginal sacculations. The concentric or horseshoe-shaped profile of the lamellar body observed in this study is accounted for by different section planes through the cup-shaped structure.View full abstractDownload PDF (4500K) -
Masako OHATA1979 Volume 42 Issue 2 Pages 103-118
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSThe testicular interstitial cell of the bat, Myotis schreibersi (Temmink), captured late in August was electron microscopically investigated. The cytoplasm of Myotis interstitial cells is packed by strikingly numerous mitochondria with many electron dense small matrix granules, endoplasmic reticulum and variable numbers of osmiophilic lipid droplets.
The Myotis interstitial cell is characterized by alternate development of the SER and RER: In some Leydig cells the major part of the cytoplasm is packed by tubular SER, whereas in others this apparently is replaced by abundant free ribosomes containing sparse cisternae of the RER. These changes in the amounts of SER and RER are likely reversible and probably reflect functional alterations of Leydig cells of the bat, a hibernator.
The Myotis interstitial cell possesses small cytoplasmic crystalloids composed of regularly oriented, compressed tubules, 20-28mμ thick, which are continuous to the tubular SER (SER derived crystalloids). Type I and type II crystalloids are classified, which show, in suitable planes of section, honeycomb-like and fabric-like patterns, respectively.
The Myotis Leydig cell extends cytoplasmic processes of irregular shape and long microvilli, the latter often conglomerates on the cell body or cytoplasmic processes. The entire surface of the cell including the processes is completely surrounded by a basal lamina.View full abstractDownload PDF (10778K) -
Kazuhiko SHOUMURA1979 Volume 42 Issue 2 Pages 119-128
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSThe laminar and size distribution of commissural efferent neurons were studied in the cat visual cortex including area 17, 18, 19 and the lateral suprasylvian cortex (the lateral wall of the middle suprasylvian gyrus) by means of retrograde transport of horseradish peroxidase. Single or multiple injections of the enzyme were made unilaterally along the medial part of the lateral gyrus (the adjoining parts of area 17 and 18) or along the lateral wall of the middle suprasylvian gyrus. In the contralateral cerebral cortex (area 17, 18, 19 and lateral suprasylvian cortex) the majority of peroxidase labeled commissural efferent neurons was identified in layer III with a smaller population in other layers except layer I. The size distribution of labeled cells of layer III showed that all sizes of neurons contribute to interhemispheric connections, ranging from small cells which are comparable to those predominating in layer III of the acommissural medial area 17 to the characteristic large pyramids of layer III at the area 17/18 boundary. There was a certain difference in the pattern of size distribution of commissural efferent neurons of layer III between area 17, 18, 19 and the lateral suprasylvian cortex. Labeled neurons in area 17, 18, 19 showed a dominant peak in the histograms of cell size, while in the lateral suprasylvian cortex they were more evenly distributed in a wide size range.View full abstractDownload PDF (1699K) -
II. Electron Microscope Observations on the Appearance and Differentiation of the Merkel CellTamiko TACHIBANA1979 Volume 42 Issue 2 Pages 129-140
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSThe appearance and cytodifferentiation of the Merkel cell were studied electron microscopically using the developing labial ridges of Rana japonica. The most primitive Merkel cell was identified with specific cored granules with an average diameter of about 90nm. Such a primitive Merkel cell was found in the basal layer of the primitive labial ridge epithelium. As the primitive labial ridge continued to mature, the primitive Merkel cell accumulated an increased number of the specific granules, developed digital shaped cytoplasmic processes and came into contact with nerve fibers. When the labial ridge was sufficiently developed, the cell showed typical morphological features of the mature Merkel cell except for a small accumulation of tonofilament-like structures and glycogen particles. It was also observed that the position of the Merkel cell in the epithelium changed from the basel layer to the third basal layer during development. On the other hand, it was difficult to find the Merkel cell in the mesenchymal layer of the developing labial ridges. From the results, it was suggested that the cytodifferentiation of the Merkel cell in the labial ridge of an anuran tadpole occurs within the epithelium.View full abstractDownload PDF (9352K) -
Koichi TSUKIYAMA1979 Volume 42 Issue 2 Pages 141-152
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSIntercellular junctions in the exocrine pancreas, through which pancreatic enzymes may leak out from the lumen into the intercellular spaces, were studied in the rat by means of electron microscopy using tannic acid as a tracer and freeze-fracture methods as well as conventional thin sections.
In thin sections and freeze-fracture replicas from the pancreas stimulated or not stimulated by exogenous pancreozymin, tight junctions were located between adjacent cells of the acinus or duct at the level just below the lumen. Observation of freezefracture replicas revealed that the number of strands or furrows in the tight junction did not differ significantly between the two groups but the width of the tight junction area was narrower and the distance between neighboring strands or furrows in the junction was smaller in the stimulated pancreas than in the control pancreas. Tannic acid, the molecular weight of which is smaller than that of pancreatic enzymes, could not pass beyond the tight junction area into the lumen.
This study suggests that the pancreatic enzymes can not leak out from the glandular lumen into the intercellular spaces by dissociation of intercellular junctions even if the pancreas is stimulated by a high concentration of pancreozymin.View full abstractDownload PDF (10265K) -
Osamu OHTANI1979 Volume 42 Issue 2 Pages 153-167
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSArterial terminals and peribiliary plexuses in the rabbit liver were studied by the injection replica scanning electron microscope method.
The branches of the hepatic artery are classified into three categories: (1) branches forming the peribiliary plexus, (2) terminal and some collateral branches which directly pour into the sinusoids at the periphery of the hepatic lobules, (3) branches which form poor capillary networks in the Glisson's sheath and finally join the peripheral sinusoids.
The peribiliary plexus consists of two layers. The inner layer is a capillary network and the outer layer, a venous network. The efferent vessels arise from the venous network of the peribiliary plexus and have two different drainages: (1) into the adjacent hepatic sinusoids as the “lobular branches or routes” aud (2) into the interlobular veins as the “prelobular branches or routes.” The former branches correspond to the “radicular portal veins” of KIERNAN (1833), and the latter to the “internal roots” of FERREIN (1749). Both routes deserve designation of peribiliary portal system. The plexus surrounding small bile ducts comprises a single layer of fine capillaries. Their connections with the hepatic sinusoids and the interlobular veins are quite the same as in the two-layered plexus.
The pattern of the peribiliary drainage in the rabbit liver is similar to that in the rat liver (OHTANI and MURAKAMI, 1978).
A possible significance of the peribiliary portal system as the transport route of hormones produced from the bile duct wall is discussed.View full abstractDownload PDF (10481K) -
Gyoetsu KUDOH, Kazuo HOSHI, Tadashige MURAKAMI1979 Volume 42 Issue 2 Pages 169-180
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSThe innervation of the human spleen was investigated by the fluorescence method for adrenergic nerve fibers (52 cases) and the enzyme histochemical method for cholinergic nerve fibers (27 cases). The spleens examined were removed by laparotomy chiefly for gastric cancer.
Adrenergic nerve fibers were demonstrated at the medioadventitial junction and the media in the trabecular arteries, whereas they occurred at the medioadventitial junction in the central and penicillar arteries. They were not found in the trabecular and pulp veins and venules, sheathed capillaries, avascular trabeculae, white and red pulp, and capsule. Nerves containing only a few adrenergic fibers and nerves without adrenergic fibers occurred close to the trabecular arteries. It was also demonstrated that nerves close to the trabecular arteries contain cholinergic fibers.
The present study first verifies histochemically that the human spleen is innervated doubly by adrenergic and cholinergic nerve fibers.View full abstractDownload PDF (5431K) -
William J. KRAUSE, J. Harry CUTTS1979 Volume 42 Issue 2 Pages 181-190
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSSpermatozoa of the opossum, Didelphis virginiana, were taken from three different regions of the epididymis and examined by scanning electron microscopy, phasecontrast and dark-field microscopy. It has been demonstrated that marked morphological changes occur in spermatozoa during their passage through the epididymis. In the first segment or head of the epididymis, spermatozoa are non-motile and the long axis of their nuclei is perpendicular to that of the tail. The nucleus is V-shaped with a thick and a thin arm. At the junction of the two arms, where the arms join, the articular fossa receives the capitulum of the connecting piece which attaches the head of the spermatozoon to the tail. Spermatozoa from the central region of the epididymis show a re-orientation of the nuclei which now lie parallel to the long axis of the tail. Both paired and unpaired spermatozoa are found and show an increase in motility. In the caudal region of the epididymis all spermatozoa are paired. Pairing occurs as a result of the close apposition of adjacent cell membranes covering the acrosomes of the larger arms.View full abstractDownload PDF (5869K) -
1979 Volume 42 Issue 2 Pages 191-193
Published: 1979
Released on J-STAGE: February 20, 2009
JOURNAL FREE ACCESSDownload PDF (326K)
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