All issues
Volume 68 (1991 - 199･･･
- Issue 6 Pages 319-
- Issue 5 Pages 259-
- Issue 4 Pages 215-
- Issue 2-3 Pages 81-
- Issue 1 Pages 1-
Predecessor
Volume 68, Issue 1
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
-
Masao ASARI, Kiyoaki SASAKI, Shin-ichi IGARASHI, Tomoko AMASAKI, Hirom ...1991 Volume 68 Issue 1 Pages 1-6
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe development of the ferret ileum was studied in order to determine the pattern of morphological maturation during the postnatal period. In the newborn, intestinal villi were short, and lined by simple columnar enterocytes with striated borders and small vacuoles. At one week old, the equivalent cell had large vacuoles that were shown on TEM to be related to a tubulovesicular system in the apical region of the cytoplasm. At two and three weeks old, the epithelial cells at the same site showed a more extensive tubulovesicular system, and vacuoles occupied major areas of both the supra- and subnuclear cytoplasm. At six weeks old (weaning), although the enterocytes contained a few small intracellular vesicles, they appeared histologically more mature than in previous stages. At nine weeks and in the adult, the villi were longer and the enterocytes no longer contained vacuoles. In TEM, the epithelial cells had long microvilli, and the apical tubulovesicular system and vacuoles had completely disappeared from the cytoplasm.View full abstractDownload PDF (3029K) -
Shigeki MIZUKAMI, Shigenori TANAKA1991 Volume 68 Issue 1 Pages 7-14
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe internal thoracic artery (ATI) of rats was macroscopically studied. In this study, the overall features of the artery were virtually elucidated in entirety. The artery was found to arise from the subclavian artery in the thoracic cavity and to immediately break up into the following branches: (1) the pericardiacophrenic artery, (2) the superior epigastric artery, (3) the thymic branch, (4) the comitans branch to the brachiocephalic veins, and finally (5) the bronchoesophageal trunk.
As is well known, rats are devoid of the superior caval veins, retaining instead a pair of brachiocephalic veins into adulthood; this is a greatly beneficial condition as it enables us to consider the essential relationships of the ATI to relevant structures which are thought to be directly involved in the development of the ATI. In fact, the rat ATI revealed topographically a remarkable intimacy with the phrenic nerve, the brachiocephalic and inferior caval veins, the heart and lungs and also with the diaphragm; in their development all are in close relationship with the pleuropericardial fold. This fact leads us to the opinion that, for a better understanding of the morphological meanings of the ATI, an understanding of the relationship of this artery to the pleuropericardial fold seems to be a prerequisite.View full abstractDownload PDF (2101K) -
Kiyoshi SATOH, Toshio SHIRAI1991 Volume 68 Issue 1 Pages 15-23
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSIn the present study the degeneration of extrinsic nerve fibers was first investigated in the duodenal myenteric plexus after their transection, and subsequently synaptic connections of the extrinsic nerve fibers were observed with their degenerative changes to examine the relationship of the extrinsic nerve fibers with the neuronal circuits in the myenteric plexus.
Adult rats were anesthetized with pentobarbital, and the extrinsic nerve fibers running with the coeliac and superior mesenteric arteries were cut at about 2 mm distance from the coeliac ganglia to duodenum. Their duodena were fixed at 6 and 12 hours, and 1,2,4,7 and 11 days after the extrinsic denervation, and their myenteric plexuses were observed with the electron microscope. Then, montages on 22 fields of the myenteric plexuses of 7 days after the denervation were made, and the number of all synapses and degenerated synapses in them was counted in each montage.
1. The degenerated changes of the extrinsic nerve fibers
Three types of the degenerated axons were found in stages ranging from 12 hours to 11 days after the extrinsic denervation as follows: 1) Type I appeared mainly at 1 and 2 days. The electron density in the axoplasm decreased, and the synaptic vesicles accumulated in the central area of the axoplasm.2) Type II appeared, also, at 1 and 2 days. The electron dense material occupied the axoplasm or the myelin-like structure appeared in the slightly swollen axons.3) Type Ill appeared in stages from 1 to 11 days. Electron dense bodies appeared in the axoplasm.
Furthermore, two types of degenerative changes were found in the presynaptic axon terminals of the extrinsic nerve fibers.1) In stages from 2 to 7 days the electron dense bodies appeared among the synaptic vesicles.2) In stages from 7 to 11 days the axoplasm became pale and the synaptic vesicles decreased in number. The degenerated changes in the presynaptic axon terminals seemed to appear remarkably at 7 days after the denervation.2. Synaptic connections of the extrinsic nerve fibers in the myenteric plexus
The distribution of synaptic connections was 9.10 ±1.38/103 μm2, and that of degenerated axons was 0.84 ± 0.38/ 103 μm2. The ratio of the degenerated presynaptic axon terminals to normal ones was 7.4 ±1.8%. These degenerated axons made almost axo-somatic synapses.View full abstractDownload PDF (3928K) -
Kyoko MURAKAMI, Hitoshi YOSHIOKA, Hisashi SAKAI, Shinobu AWAYA, Masahi ...1991 Volume 68 Issue 1 Pages 25-31
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe histological abnormalities of chick embryos with bilateral microphthalmus were examined in serial paraffin sections with special reference to laterality in the visual apparatuses, including the cornea, lens, neural retina and pigment epithelium. There was marked laterality in the above structures; some eyeballs had individual, if incomplete, sublayers of the cornea and the neural retina, and others not. The sublayers of the neural retina were occasionally observed even in eyeballs at the stage of optic vesicle formation, in contrast to the previous notion that the pigment epithelium induces the maturation of the primordial neural retina after optic vesicle differentiation into the optic cup. There was also a case where developmental differences between the right and left eyeballs were absent except in the lens. These findings suggest that chick embryos with bilateral microphthalmus exhibit a more complex histological profile or diversity than previously considered, possibly as a result of the differential actions of various mutagens and endogenous trophic factors on the developing visual system.View full abstractDownload PDF (2920K) -
Koji KAMI, Peter J. STOWARD1991 Volume 68 Issue 1 Pages 33-40
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSVitellogenin has been localized at the electron microscopical level in the liver of the cockerel using a colloidal gold technique. White leghorn coekerels were treated with 17β-oestradiol to induce vitellogenesis. Pieces of liver were removed from control and experimental birds on the 4th and 8th days following hormone treatment, and embedded in Lowicryl K4M. Vitellogenin was isolated from the plasma of oestradiol-treated cockerels, and the antibody to it elicited in rabbits and made vitellogenin-specific by affinity chromatography on lipovitellin-Sepharose columns. At the light microscopical level, the intensity of immunohistochemical staining was considerably above background levels in oestradioltreated cockerels. At the electron microscopical level, gold particles indicating antigenic sites of vitellogenin were largely confined to the rough endoplasmic reticulum, Golgi apparatus, immature and mature secretory vacuoles, and numerous lysosomes and phagosomes within hepatocytes and sinusoidal cells respectively. These observations strongly suggest that the intracellular pathway of vitellogenin secretion in chicken hepatocytes under the experimental conditions studied involves external stimuli and secretory vacuoles. The labelling of lysosomes may reflect catabolic turnover (crinophagy).View full abstractDownload PDF (3672K) -
Actual Characteristics of the Glands Distributed in the Lamina Propria Mucosae of the Fowl EsophagusTaizo SHIBATA, Masatake IMAI, Keiichi MOROGUCHI, Yoshihiko TAKADA, Hir ...1991 Volume 68 Issue 1 Pages 41-45
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSWe performed histological and histochemical investigations on the glands distributed in the lamina propria mucosae of the fowl esophagus and demonstrated their actual characteristics.
1. Glandular cells of the compound tubular glands located in the lamina propria mucosae contained a number of fine pepsinogen granules.
2. Reactions to neutral, weak and strong acid mucopolysaccharides, neutral mucus type II and III and sialomucin were evidently positive in these cells.
3. Based on the facts in 1) and 2), we consider that the glands located in the fowl esophagus are undifferentiated gastric glands.
4. The same glands possessed no parietal cells.
5. We demonstrated that the esophageal cardiac glands in the lamina propria mucosae of human esophagus were undifferentiated gastric glands, and they possessed parietal cells. These glands were confirmed in humans alone among the mammalia.
6. The significance of the existence of the same kind of gland in human and fowl esophagus is extremely important.
7. PAS-positive substance in the above-mentioned glands in the fowl esophagus contains sulfuric, acid, neutral mucopolysaccaride and neutral mucus of type II and III but no glycogen.
The compound tubular glands distributed in the lamina propria mucosae of the fowl esophagus have been described as mucous glands. We performed histochemical investigation and demonstrated that these glands were undifferentiated gastric glands.View full abstractDownload PDF (1814K) -
Liberato J. A. DIDIO, Dulcino TOSE, Maria A. MIGLINO1991 Volume 68 Issue 1 Pages 47-50
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSIn 20% of 40 human hearts, AV and VA branches of the coronary arteries supplied the wall of cardiac chambers on the opposite side of the heart.
VA branches were more frequent than AV branches and both were observed at the level of the crux cordis (in the diaphragmatic aspect of the heart).View full abstractDownload PDF (1713K) -
Shoji CHIBA, Takao SUZUKI, Tatsuo KASAI1991 Volume 68 Issue 1 Pages 51-66
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe characteristic features of a tongue-like projection of the left lobe of the liver in a female adult, accompanied with a large lienorenal venous shunt and an intrahepatic anastomosis of the hepatic arteries, are described. By dissecting the liver parenchyma, this projection is supplied by a set of the lateral segmental branches of the portal vein, hepatic artery and hepatic ducts and by the branch of the left hepatic vein. The boundary between the abnormal and the proper left lobes can not be confirmed accurately, because the tongue-like projection is overlapped with the paraumbilical lobe on the visceral surface. However, the position is estimated a transverse line superior to the attachment to the proper left lobe. The anomaly is derived from a medial and inferior portion of the left lobe of the liver and may be regarded as a left half of the central lobe in the ape etiologically. No evidences to justify the co-existence of the tongue-like projection with the lienorenal shunt are confirmed.View full abstractDownload PDF (5538K) -
Kuniaki TOYOSHIMA, Eiko HONDA, Teruyuki HIRAKAWA, Akitatsu SHIMAMURA1991 Volume 68 Issue 1 Pages 67-69
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe changes in neuron-specific enolase (NSE) immunoreactivity of Merkel cells in the frog taste organ were investigated up to 5 months after resection of the glossopharyngeal nerve. Even at 5 months after denervation, the denervated Merkel cells exhibited an immunoreaction with NSE antiserum.View full abstractDownload PDF (1139K) -
Nobuharu IWAHORI, Kaori NAKAMURA1991 Volume 68 Issue 1 Pages 71-80
Published: 1991
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe intrinsic organization of the red nucleus (RN) was studied in the mouse using the rapid Golgi method. Cytoarchitecturally, the RN was divided into the magnocellular (RNmc) and parvocellular parts (RNpc). The former occupied the caudal one-third and the latter formed the rostral two-thirds of the RN. Based primarily on the size of somata, the RN neurons were classified into four types: giant, large, medium-sized and small neurons. Of these, the former two types of neurons were distributed mainly in the RNmc, while the latter two types of neurons were seen mainly in the RNpc. Axons of the RN neurons, at least those of the former three types of neurons, ran medially or caudomedially. Some axons ran across the mesencephalic raphe region to be lost in the medial region of the contralateral tegmentum. Two groups of afferent fibers to the RN were distinguished. Group I afferents were fibers composing the superior cerebellar peduncle. After crossing in the decussation of the superior cerebellar peduncle, these fibers entered the RN from the caudomedial aspect, ran rostrally in the nucleus emitting numerous collaterals. Group H afferents reached the RN from the ventrolateral aspect and traveled mediodorsally to be distributed totally within this nucleus.View full abstractDownload PDF (3129K)
- |<
- <
- 1
- >
- >|