巻号一覧
81 巻, 1 号
選択された号の論文の4件中1～4を表示しています
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Ryosuke NAKANISHI, Jun GOTO, Hiromitu EZURE, Hiroyuki MOTOURA, Shin-ic ...2004 年 81 巻 1 号 p. 1-4
発行日: 2004年
公開日: 2008/01/18
ジャーナル フリーMyelinated axons in the human lateral corticospinal tract (LCST) at the C6 and L4 levels were examined on 16 male cadavers, with age ranging from 41 to 88 years. The average area of axons in the LCST was measured using a microscopic image-analyzing system. Our data show that the average area of axons at the C6 and L4 levels decreased with age. We also noticed that the average area of axons was larger at the C6 level than at the L4 level in all cases. This decrease may be related to a parallel decrease of conduction velocity in the LCST during the ageing process.抄録全体を表示PDF形式でダウンロード (160K) -
Michiko NAKATSUKA, Yasutomo IWAI, Seong-Suk JUE, Sang-Hoon OH, Lian GU ...2004 年 81 巻 1 号 p. 5-14
発行日: 2004年
公開日: 2008/01/18
ジャーナル フリーTo evaluate the morphology of dental arches, 62 (male: 36, female: 26) paired casts having normal dentitions and occlusion were selected from 396 (age: 18 to 26 years old; male: 257, female: 139) sets of dental study models. The maxillary dentitions were preliminarily classified as square, round-square, round and round V-shaped arches based on the conventional morphological descriptions. Midpoints of the incisor edge (I1R, I1L, I2R, & I2L), summits of the cuspids (CR & CL), buccal cusps of the premolars (P1R, P1L, P2R, & P2L), mesial buccal cusps of the first and second molars (M1R, M1L, M2R, & M2L), and the midpoint (A) of line I1R-I1L were designated as reference points. From A, let a vertical line intersected line M2R-M2L at reference point B. The line A-B intersected CR-CL at reference point E. We evaluated 1) the protrusion of the cuspids by ① angle I2R-CR-P1R (∠R) + angle I2L-CL-P1L (∠L); 2) the curvature of the anterior teeth by ② A-B/CR-CL, ③ 180°C∠CR-A-CL, and ④ A-E/CR-CL; 3) the length to width ratio of the dental arch by ⑤ A-B/ M2R-M2L; 4) the degree of roundness of the maxillary arch by estimation of ⑥ (rθ5 - rθ4)R - (rθ5 - rθ4)L; and 5) an item ⑦ for the differentiation of type I and type II round-square arches by relating the bilateral contour and position of break line P1-P2-M1-M2 (i) to line P1-M2 (ii). The data of items ①, ②, ③, ④, ⑤, and ⑥ were further standardized and summarized into three essential principal components: 1) the curvature of the anterior teeth, 2) the curvilinear contour of the dental arch, and 3) the length-to-width ratio of the dental arch. The results indicated that: 1) 60% of the maxillary dentitions were round-square arches which showed no prominent principal component; 2) square maxillary arches distinctly showed a small ① ∠R - ∠L; 3) round arches were characteristic by small ⑥ (rθ5 - rθ4) + (rθ5 - rθ4)L values; and 4) round V-shaped arches had large ②, ③ and ④ values.抄録全体を表示PDF形式でダウンロード (238K) -
Bibin Bintang ANDRIANA, Takuo MIZUKAMI, Maki ISHII, Yoshiakira KANAI, ...2004 年 81 巻 1 号 p. 15-24
発行日: 2004年
公開日: 2008/01/18
ジャーナル フリーThe multivesicular nuclear body (MNB) within the Sertoli cell nucleolus has been observed in the ruminant testis, but not in other mammalian species. Generally, the MNB is composed of vesicles, tubules and ribosome-like structures. This study has been conducted in order to clarify MNB formation during postnatal development. The testes were obtained from immature Shiba goats at 1, 2, 3, 4, and 5 months old, and from adults. They were fixed with 5% glutaraldehyde, postfixed with 1% OsO4, dehydrated in ethanol and embedded in Araldite-M. The serial cross-sections of seminiferous tubules were morphologically and morphometrically observed using light and transmission electron microscopy. In these Shiba goat testes, the MNB contained vesicles and tubules in various sizes, as well as ribosome-like structures. The volume of each Sertoli cell nucleus at each age (1, 2, 3, 4, 5 months old and adult) was about 269.3µm3,327.1µm3, 361.3µm3, 431.2µm3, 525.0µm3, and 760.4µm3, respectively. The average number of vesicles per Sertoli cell nucleus was 0, 7.4, 11.1, 12.3, 15.5, and 32.7, respectively. At 1 month old, one or more nucleoli with fibrillar components were identified in the Sertoli cell nucleus. No MNB was observed. At 2 months old, a MNB first appeared, though it was underdeveloped and infrequently encountered. At this stage, a MNB, consisting of a small amount of vesicles and ribosomes, was located in the peripheral region of the nucleus. At later stages (3, 4, and 5 months old), MNBs gradually developed, increased in number, moved from the periphery to the central region of the nucleus, and associated with the nucleus to form a well-developed MNB. In the adults, the Sertoli cell nucleus displayed a welldeveloped and large-sized MNB situated in the central region.抄録全体を表示PDF形式でダウンロード (719K) -
Kazuyoshi SAKAI, Genzoh ISOMURA2004 年 81 巻 1 号 p. 25-32
発行日: 2004年
公開日: 2008/01/18
ジャーナル フリーThe epithelium of the anal tonsil of the laboratory shrew was studied by scanning and transmission electron microscopy, with particular attention focused on the structure of the epithelium lining the anal tonsillar crypt. The tonsillar crypt surface is lined by two kinds of epithelia: squamous epithelium, which is located mainly at the neck of the crypt and includes keratohyalin granules in the superficial layer, and reticular epithelium, which is invaded by many immigrating cells and has several micropores immigrating cells to pass through. In addition, basal granulated cells are present in the basal layer. These results suggest that the reticular epithelium of the anal tonsil belongs to the welldeveloped gut-associated lymphoid tissue (GALT) in the alimentary canal. It represents a specialized and important compartment in immunological function, similarly to the palatine tonsils of other mammals, and has as yet unknown roles in digestion.抄録全体を表示PDF形式でダウンロード (681K)
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