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Volume 68 (1991 - 199･･･
- Issue 6 Pages 319-
- Issue 5 Pages 259-
- Issue 4 Pages 215-
- Issue 2-3 Pages 81-
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Volume 68, Issue 6
Displaying 1-7 of 7 articles from this issue
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Kaoru INOUE, Toshio TERASHIMA, Yoshiro INOUE1992 Volume 68 Issue 6 Pages 319-331
Published: 1992
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe postnatal development of the corticotectal projection was investigated by injecting the axon tracer DiI into the visual cortex of mouse pups. It was found that DiI-labeled axons arrive at the ipsilateral superior colliculus and enter the optic nerve layer of this structure on postnatal days 3 and 4 (P3-P4). These corticotectal axons extend into the caudal end of the superior colliculus on P4 and give off small collateral branches that ascend vertically to the superficial gray layer. During the first two postnatal weeks, the collateral branches do not form a demarcated terminal zone, but rather diffusely spread within the superficial gray layer of the superior colliculus. These collateral branches continue to dichotomize and form a bright terminal zone within the superficial gray layer on P11. The terminal zone decreases in size during the second and third postnatal weeks, and appears to be of the same size when compared with the adult counterpart by P19. The terminal zone of the corticotectal axons from the visual cortex is established by P19. In parallel with the maturation of the terminal zone of the corticotectal projection, the distal segment of the corticotectal axons is lost during the second postnatal week. We conclude that the growing tips of the corticotectal axons do not strictly project to their future terminal zone within the superior colliculus, and 'misdirected' axons are eliminated during the early postnatal period.View full abstractDownload PDF (3201K) -
Nobuharu IWAHORI, Kaori NAKAMUARA, Sanae KAMEDA1992 Volume 68 Issue 6 Pages 333-341
Published: 1992
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe intrinsic organization of the olfactory bulb (OB) was studied in the red stingray using the rapid Golgi method. The OB is horse shoe-shaped, surrounding the equator region of the nasal capsule. As seen in the sagittal sections, the OB is round with the long olfactory peduncle extending from the dorsocaudal region and the olfactory fibers in a thick bundle entering from the rostroventral aspect. Although not so distinct, the following areas are distinguished. A rostroventral ovoid area adjacent to the entrance of the olfactory fibers consists exclusively of the olfactory fibers running in various directions. Dorsocaudal to the olfactory fiber area is a wide crescent region containing thin bundles of olfactory fibers, olfactory glomeruli, mitral cells and a few disseminated granule cells. A narrow crescent area made up of scattered granule cells is located dorsocaudally to the above wide crescent area. The outermost region consists of a fiber layer encapsulating the dorsal to caudal aspect of the OB. Thus, while the major constituents of the vertebrate OB are recognized, the lamination is very obscure.View full abstractDownload PDF (2151K) -
Kyozo TAKAHASHI, Takafumi NINOMIYA1992 Volume 68 Issue 6 Pages 343-349
Published: 1992
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe brain parenchyma of Salamandrella keyserlingii Dybowski (SKD) is not vascularized except in the olfactory bulb. In the brains of SKD, neuronal and glial perikarya are seen densely aggregated at the periventricular regions and no blood vessels enter the brain parenchyma from the meningeal vessels. Former investigators have discovered no blood vessels in the brains of nine species of salamanders in the Hynobiidae, all of which inhabit Japan. This report adds one more avascular species of salamander which is found in Hokkaido, Japan. The reasons why the brain of Hynobiid salamanders is not vascularized and why only the olfactory bulbs are vascularized cannot be speculated on at the present time.View full abstractDownload PDF (2042K) -
Toshio TERASHIMA, Chitoshi TAKAYAMA, Rvoichi ICHIKAWA, Yoshiro INOUE1992 Volume 68 Issue 6 Pages 351-363
Published: 1992
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSReeler, an autosomal recessive mutation in mice, is characterized by abnormal positioning of the neurons in the cerebral cortex. We performed a descriptive analysis on the arborization of dendritic processes of large pyramidal neurons in the motor cortex (hindlimb area) of normal and reeler mice, as seen in the Golgi preparations. In the normal mouse, somata of large pyramidal neurons were located in the layer V, and their apical dendrites ascend vertically to the pial surfaces. Their basal dendrites proceed horizontally or inferiorly. In the reeler mouse, typical large pyramidal neurons with a normal (upright) apical dendrite and a variety of atypical large pyramidal neurons with a disoriented apical dendrite were radially scattered within the motor cortex. Typical large pyramidal neurons occupied the lower half of the motor cortex, whereas atypical large pyramidal neurons were predominantly observed in the upper half of the motor cortex. Atypical large pyramidal neurons were further divided into inverted, tumbled, V-shaped, bipolar and superficial polymorphic cells, as previously reported (Terashima et al., J. Comp. Neurol.218: 314-326,1983). Superficial polymorphic cells localized in the layer of polymorphic cells and the layer of the large pyramidal cells were characterized by the extremely poor dendritic arborizations and the smooth surface of the dendrites, which suggests development of dendrites of these neurons was deranged by the reeler genetic locus.View full abstractDownload PDF (4555K) -
Shoichi EMURA, Shizuko SHOUMURA, Michiya UTSUMI, Tomo YAMAHIRA, Huayue ...1992 Volume 68 Issue 6 Pages 365-375
Published: 1992
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSChanges of the water-clear cells of the parathyroid glands in adult and senile golden hamsters 2 and 5 days after starvation were investigated. The ultrastructure of the water-clear cells of the parathyroid glands in the starved adult and senile animals almost resembled that of the control adult and senile animals. However, lipid droplets were very numerous in the water-clear cells in the adult and senile animals after starvation. It is considered that starvation affects functional activity in the water-clear cells of the parathyroid gland.View full abstractDownload PDF (3706K) -
Masao SERISAWA, Nobuo SHIGEHARA, Hideo TAKAHASHI, Moriharu ETO1992 Volume 68 Issue 6 Pages 377-391
Published: 1992
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSTwo cases of Adachi-Williams-Nakagawa type N (Krause's type II-2-B) right-sided arch of the aorta were observed gross anatomically. We discovered the first in a 67-year-old female corpse during dissection practice. The second was found in an old male patient through radiography. After his death at 87 years, angiography revealed the anomaly to be of type N. Case 2 (and case 1 after the discovery of the anomaly) were dissected outside of regular dissection practice. Neither belonged to the “circumfiexus” type and in each case the ligamentum arteriosum was located on the left, forming a vascular ring. However, only case 1 exhibited marked constriction of the esophagus, explaining the dysphagia that she had suffered. This deviation was evidently caused by projection of the aortic diverticulum of case 1 in front of the vertebral column (since the origin of the descending aorta was located at a more antero-medial position in case 1 than in case 2) and narrowness of the vascular ring of case 1. On both sides in both cases, the second posterior intercostal arteries were branches of the thoracic aorta. This indicated that the high position of the arch of the aorta in both cases (the uppermost point was at the level between Th1 and Th2) is an anomaly, being not limited only to the arch of the aorta. All bronchial arteries originated from the thoracic aorta. These have not been described in association with examples of right-sided arch of the aorta, and were therefore compared against a mirror image of the normal aorta described by Kasai. However, some discrepancies were still noted.
Among the veins, the left brachiocephalic vein of case 2 was partially occluded, forming collateral circulation behind the ascending aorta. In both cases, the thoracic duct ascended on the left of the thoracic aorta, passed behind and then above the left subclavian artery, and joined the left angulus venosus. In addition, the azygos vein, recurrent laryngeal nerve, and cardiac nerves are described.View full abstractDownload PDF (4576K) -
Shigeki MIZUKAMI, Shigenori TANAKA, Madoka MORIYA1992 Volume 68 Issue 6 Pages 393-407
Published: 1992
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSBranches of the internal thoracic artery (ITA) of rats which supply the heart, the sinus regions (see Terminology 1)and the brachiocephalic veins, were macroscopically studied. Two major branches of the ITA, the pericardiacophrenic artery and the descending ramus of the bronchoesophageal artery, were found supplying branches to these central portions of the cardiovascular system (see Table 1). They constituted, together with the ordinal coronary arteries, a system of dual blood supply to the heart as reported by Grant & Regnier (1926), Halpern et al. (1953,1954) and Hebei & Stromberg (1986). This finding also supports a proposal of Grant & Regnier (1926) that the rat ITA emits cardiac branches which should be classified on the vertebrate scale to the caudal or extracoronary artery.
Branches of the ITA to the heart, the sinus regions and to the brachiocephalic veins were found to be classified into 2major groups depending on their choice of entrance - arterial porta and venous porta; the latter was further divided into 3 subgroups depending on their selection of the (lateral or pulmonary or esophageal) mesocardium for traveling to the venous porta (see Table 2).View full abstractDownload PDF (4008K)
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