巻号一覧
55 巻, 1 号
選択された号の論文の3件中1～3を表示しています
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Masatake Imai1978 年 55 巻 1 号 p. 1-18
発行日: 1978/05/20
公開日: 2012/09/24
ジャーナル フリーThe author has observed the facial muscles in six pangolins (Manis pentadactyla Linne) and concluded as follows:
1. The facial muscles in the pangolin bear some resemblances to those in the Dasypus sexcinctus, Tatusia novemcincta and Tamandua tetradactyla, but the differences in the same muscles between the pangolin and the above-mentioned xenarthra surpass the similarity.2. The differences in the facial muscles between the pangolin and the Bradypus tridactylus are greater than those between the pangolin and the xenarthra excepting the Bradypus.3. The comparison on the facial muscles between the pangolin and the domestic animals and the primates including human beings is meaningless because of the extreme differences between them.4. The muscular component in the lip of the pangolin is so complex that it is incomparable with those in the xenarthra, domestic animals and primates including human beings. Moreover, the constructions in the upper and lower lips of the pangolin are different from each other.5. The dorsal part of the lower lip bends into the oral cavity and makes a fold, Plica oralis. The lateral part of the tongue slides on the dorsal surface of this fold. Therefore, the backward and forward movements are controlled by this fold.6. The upper lip closely overlaps the base of the Plica oralis and this mechanism presumably serves to shut up tightly the Rima oris and to keep out the ants from the oral cavity.7. The Plica buccalis is a fold which is made inside the corner of the mouth to supplement the want of the Plica oralis. It serves to keep away the escape of the ants from the same corner.8. The Plica alaris in the Vestibulum nasi is well developed and is extremely useful to shut out the invaders, especially live ants.9. In addition to the muscle of mastication, the mandible in the pangolin has many muscles, and they are inserted into the lower lip, skin of the lower lip and so forth, but no M. mandibulo-auricularis.抄録全体を表示PDF形式でダウンロード (3486K) -
Isamu Takagi, Keiki Yamada1978 年 55 巻 1 号 p. 19-39
発行日: 1978/05/20
公開日: 2012/09/24
ジャーナル フリーIt has been known from transmission electron microscopic studies that cytoplasmic granules of parafollicular cells in the thyroid gland show different micrographic images depending on the types of fixation method used. The authors have made scanning electron microscopic observations of parafollicular cells by using various cracking methods to see the differences in micrographic images affected by different fixation methods.1. In scanning electron microscopic observation, the arrangement of parafollicular cells showed the same distribution and orderliness as in transmission electron microscopic observation. Cytoplasm of parafollicular cells looked more coarse than that of follicular cells and suggested the translucency seen on transmission electron microscope micrographs.2. When method (1) was used for fixation, on transmission electron microscope micrographs, cytoplasmic granules of parafollicular cells appeared as a number of well-defined black circular images. On scanning electron microscope micrographs they were observed as clearly protruded spherical granules.3. When method (2) was used for fixation, on transmission electron microscope micrographs, cytoplasmic granules of parafollicular cells were observed as vesicles having ony demarcation membranes left and its contents missing. On scanning electron microscope micrographs they were seen as flat and circular figures.4. For an overall observation of parafollicular cells the doublefixation method employed in method (1) produced the best results. Fixation method (2) was suitable for the study of various types of membranes such as cell membrane. And fixation method (3) produced favorable results in observing granules.5. As for cracking methods, the frozen resin cracking method using Epon 812 produced the best result. But some utilities were found in the alcohol cryofracture method抄録全体を表示PDF形式でダウンロード (6052K) -
Hideo Isono, Shizuko Shoumura, Katsuko Miyake, Noriko Ishizaki, Kazuko ...1978 年 55 巻 1 号 p. 41-55
発行日: 1978/05/20
公開日: 2012/09/24
ジャーナル フリーThe parathyroid gland of Rana catesbiana in summer season was studied with electron microscope and compared to the frog parathyroid gland under artificial hibernation.
In the parathyroid gland of the summer frog the parenchyma was mostly composed of the large chief cells having numerous cell organelles and only a few small chief cells having poorly developed cell organelles were observed in the central region. In the parathyroid gland 2 to 5 weeks after artificial hibernation the number of the small chief cells was increased in the central region, the number of the large chief cells being decreased in the peripheral region of the gland. There were transitional forms between these two types of the chief cell. No remarkable changes were recognized in the ultrastructure of the small chief cells after artificial hibernation.
In the large chief cells of the parathyroid gland afer artificial hibernation, cell organelles such as granular endoplasmic reticulum and the Golgi apparatus became smaller in size than those of the control frogs. Small secretory granules, large secretory granules, homogeneously dense bodies with a low electron density, and vacuolar bodies containing floccular substance, dense material, vesicles and/or lipidlike substance were reduced in number after the experiment. There were transitional forms between each of secretory granules, homogeneously dense bodies and vacuolar bodies. It is conceivable that large secretory (storage) granules were changed into vacuolar bodies through homogeneously dense bodies.
Small secretory granules were seen near the plasma membrane, their limiting membrane was linked to the plasma membrane by a filamentous structure, and the contents of them communicated with intercellular space through a hiatus in the plasma membrane. These observations suggest that internal core of small secretory granule may be discharged through a hiatus in the plasma membrane into the extracellular space.抄録全体を表示PDF形式でダウンロード (5721K)
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