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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Anatomia, histologia, embryologia 18 (1989), S. 0 
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Mechanisms of development of the cupula of the semicircular canals of birds (Gallus gallus) I. Secretory cellsA study of the crista ampullaris of the vestibular apparatus was carried out in chicken embryos. The study group included embryos between stages 24 and 39 of Hamburger-Hamilton. This study elucidates the relationship of the cupula with respect to the epithelium of the crista ampullaris. With electron microscopic examination, the rough endoplasmic reticulum of the crista epithelial sustentacular cells at developmental stage of 31 H-H, demonstrated dilatations containing secretory material. Vesicles, with adhering ribosomes appear to be formed from these dilatations. At later stages of development, the vesicular material took on the characteristics of the fibrillary material composing the cupula. In some cells, secretory vesicles are seen near the apical border of these cells, where they apparently secrete vesicular contents into the endolymphatic space, contributing to the formation of the cupula.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Mechanisms of development of the cupula of the semicircular canals of birds (Gallus gallus) II. Cellular reorganizationA light microscopic study of the epithelia of the crista ampullaris of the semicircular canals of the embryonic chicken indicates that the epithelial cells undergo irregular degenerative changes, with continual mitotic replacement of surface cells. The cupula develops over the surface epithelia through vesicular secretions containing acidophils fibrillar material mixed with globular formations derived from fragmentation of the surface epithelial cells.Electron microscopic studies demonstrate the mode of secretion of rounded or oval supraepithelial bodies from surface epithelium, contributing to the development of the cupula ampullaris. These observations provide evidence of cytoplasmic contributions of surface epithelial cells of the crista ampullaris contributing to the development and continued reorganization of the cupula ampullaris during embryonic development.
    Type of Medium: Electronic Resource
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  • 3
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 27 (1998), S. 708-710 
    ISSN: 1432-2161
    Keywords: Key words Wrist ; Intraosseous ganglia ; Lunate ; X-ray ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  An intraosseous ganglion is a relatively uncommon, benign, cyst-like lesion that occurs in young and middle-aged adults. Most commonly seen adjacent to the hip, ankle, knee, or wrist, they are histologically identical to their soft tissue counterparts. A review of the literature revealed only two previously reported examples of bilateral symmetrical ganglia of the lunate bones.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0942-0940
    Keywords: Ulnar entrapment neuropathy ; ulnar nerve compression ; cubital tunnel syndrome ; traumatic ; non-traumatic ; neurolysis ; anterior transposition ; results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The outcome of 53 patients operated on either for posttraumatic ulnar neuropathy (PUN) or non-traumatic cubital tunnel syndrome (CTS) was reviewed after 3 years follow-up. Results were analyzed and compared considering the surgical technique used (neurolysis versus anterior transposition or combined) and a variety of clinical features that could influence outcome after nerve release. In the whole series, excellent outcome was obtained in 39 patients (73%). No major differences were found with the different surgical procedures. Slightly better results, but no statistically significant, were found in cases with CTS. As to clinical parameters, patients with CTS had a higher mean age, a shorter duration of symptoms and most were men. The presence of symptoms for more than one year before operation significantly diminished the chance of satisfactory recovery in cases with CTS, but not in those with PUN. For both CTS- and PUN-cases with symptoms for more than one year, neurolysis plus anterior transposition was the more useful technique. Our study shows that CTS and PUN differ to a certain extent in their clinical profile, electrophysiological findings and response to different surgical approaches and hence can be considered as two different clinical entities.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 10 (1986), S. 163-170 
    ISSN: 1432-5195
    Keywords: Physial distraction ; Bone lengthening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une étude expérimentale portant sur la distraction épiphysaire au niveau de l'extrémité distale du fémur a été réalisée chez 45 moutons âgés de 2 mois, dans le but d'étudier les mécanismes d'allongement ainsi que la vitalité du cartilage de croissance. Les animaux ont été divisés en trois groupes (A, B, C) et 9 sous-groupes (1, 2, 3) selon la vitesse de l'allongement (2 mm/jour, 1 mm, 0,5 mm) et la date à laquelle ils ont été sacrifiés. Les résultats obtenus montrent que le mécanisme de base consiste dans la création d'une fracture épiphysodiaphysaire et, d'autre part, que plus la vitesse d'élongation est lente, plus le cartilage de croissance est viable à court et à long terme. Les meilleurs résultats furent obtenus à la vitesse de 0,5 mm/jour. On peut donc conclure qu'en pratique la distraction épiphysaire peut être indiquée chez les enfants dont l'âge osseux est bas, et qu'elle peut être répétée ultérieurement, à condition de maintenir la vitesse d'allongement dans des limites raisonnables.
    Notes: Summary Experimental physial distraction was carried out in the distal part of the femur in 45 two-month old lambs in order to study the basic mechanisms of lengthening as ell as the viability of the growth cartilage after using this method. The animals were divided into three groups (A, B and C), and each group into three subgroups (1, 2 and 3) according to the rate of distraction used (2 mm/day, 1 mm/day, 0.5 mm/day) and the time of sacrifice. The results obtained show that the basic lengthening mechanisms consists, firstly, in the production of a fracture between the metaphysis and the epiphysis and, secondly, that the lower the distraction speed employed, the greater is the short-term and long-term viability of the growth cartilage. Optimum viability was observed at a distraction rate of 0.5 mm/day. On this basis we conclude that in clinical practice physial distraction could be indicated for children at an early stage of skeletal growth and repeated later provided that the rate of distraction is kept within reasonable limits.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 9 (1985), S. 223-229 
    ISSN: 1432-5195
    Keywords: Physeal bone bridge ; Physeal distraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Nous avons eu recours depuis Juin 1983 à la distraction épiphysaire pour rompre les ponts osseux et pour le traitement ultérieur des déformations des os longs chez les enfants en fin de croissance. Dans tous les cas (4 os chez 3 malades) il existait une déformation de l'extrémité d'un os long due à un pont osseux résultant d'un traumatisme antérieur du cartilage de conjugaison. Les résultats ont été excellents et à notre avis cette méthode présente de nombreux avantages par rapport aux autres. L'opération elle-même est peu agressive et n'entraîne que très peu de dommages. Elle ne nécessite ni matériel de synthèse ni greffe osseuse. Elle permet d'obtenir un allongement et de rectifier la correction d'une angulation au cours du traitement. Pour conclure nous estimons qu'il est possible de corriger les déformations axiales et les raccourcissements dus à un pont osseux par la distraction épiphysaire, sans qu'il soit besoin de réséquer le pont osseux. Nous recommandons cette méthode chez les enfants en fin de croissance, notamment dans les cas qui comportent un raccourcissement osseux.
    Notes: Summary Physeal distraction for breaking bony bridges and the late treatment of long bone deformities in children near maturity, has been used in our Department since June, 1983. In all cases (4 bones in 3 patients) a deformity was present at the extremity of a long bone due to a bony bridge caused by a previous injury to the growth cartilage. The results were excellent and in our opinion there are advantages over other methods. The operation itself is not extensive and very little damage is done. There is no need for internal fixation or bone grafts. It is possible to obtain lengthening and to adjust the angular correction during treatment. We conclude that it is possible to correct angular deformities and bone shortening due to bony bridges by physeal distraction without the need for resection of the bony bridge. At present we recommend this method in children near skeletal maturity, especially in those cases with bone shortening.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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