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  • Deep vein thrombosis  (2)
  • Kinetics  (2)
  • Orthoptera  (2)
  • 1
    ISSN: 1432-1351
    Keywords: Orthoptera ; Tettigonioidea ; Song frequency ; Song recognition ; Sex difference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The song of the male bushcricket Ancistrura nigrovittata consists of a sequence of verses. Each verse comprises a syllable group, plus, after about 400 ms a single syllable serving as a trigger for the female response song. The carrier frequency of the male song spectrum peaks at around 15 kHz, while the female song peaks at around 27 kHz. The thresholds of female responses to models of male songs are lowest for song frequencies between 12 and 16 kHz and therefore correspond to the male song spectrum. The threshold curve of the female response to the trigger syllable at different frequencies has the same shape as the tuning for the syllable group. Phonotactic thresholds of male Ancistrura nigrovittata to synthetic female responses at different frequencies are lowest between 24 and 28 kHz and thereby correspond to the female song spectrum and clearly differ from female response thresholds. Activity of the tympanic fibre bundle of both sexes is most sensitive between 15 and 35 kHz and therefore not specifically tuned to the partner's song. Individual behavioural thresholds have their minimum within 10 dB of the values of tympanic thresholds.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1351
    Keywords: Orthoptera ; Tettigonioidea Acoustic communication ; Duetting ; Song models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Mate finding in the phaneropterid bushcricket Ancistrura nigrovittata is achieved by a duet, where the female replies with a short sound to the male song. In experiments with artificial song models we analysed the parameters necessary for eliciting a female response. A verse of the male song consists of a group of 5–9 syllabes which after an interval of about 400 ms is followed by a final syllable. The female response was shown to depend on two processes: (i) recognition of the syllable group as belonging to a conspecific male and (ii) perception of the final syllable as a trigger. Critical parameters for the recognition process are the duration of syllables and syllable pauses, as well as the number of syllables in a group. However, even with an optimal syllable group, the response probability still depends on the interval between the syllable group and the final syllable. The female only responds when the final syllable of the male song occurs within a 250 ms long time window begining approximately 250 ms after the end of the male's syllable group. Her reply consists of a single tick, which follows the male's final syllable with a latency of only 25 ms.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 133-137 
    ISSN: 1279-8517
    Keywords: Deep vein thrombosis ; Total hip replacement ; Femoral vein ; Posterior approach ; Lateral approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract An anatomic study was undertaken to establish whether positioning of the leg and surgical approaches for total hip replacement (THR) cause changes in the femoral v. which may contribute to the development of deep vein thrombosis (DVT). The patency of 32 femoral vv. of 18 cadavers was inspected at different levels during simulated THR. Before and after removal of the femoral head through a transgluteal or posterior approach, a wide-angle endoscope was inserted into the femoral v. via the external iliac v. Blood flow was simulated by proximal irrigation with saline through the popliteal v. After removal of the femoral head distinct changes were observed in both approaches. In the transgluteal approach the changes were dependent on the degree of adduction and the body build of the cadaver. Initially, an oval form was seen in a constricted lumen with an increasingly oblique oval deformation and a final facet-like closure, usually at about 5 to 7.5 cm below the inguinal ligament. In total adduction this stenosis occured regardless of build. Using a posterior approach, the necessary internal rotation caused a closure of the vein in 50% of cases. In combination with flexion and adduction there was stenosis in all cadavers regardless of body build. Our results indicate that the duration of the adducted position of the thigh during THR via a transgluteal approach should be minimised, as there is a reduction in blood flow with even minor degrees of adduction. In the posterior approach the stenosis occurs earlier, and is independent of the build of the cadaver.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 20 (1998), S. 41-45 
    ISSN: 1279-8517
    Keywords: Shoulder ; Kinetics ; Subacromial bursa ; Capsular ; Impingement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Dans cette étude anatomique les mouvements de l'articulation scapulohumérale ont été étudiés essentiellement au niveau de la région subacromiale. Après dissection de la capsule articulaire et de la région subacromiale de 80 épaules non embaumées, les rapports anatomiques de l'espace subacromial ont été étudiées en position neutre et lors de l'abduction (à 30°, 60° et 90°, la scapula étant maintenue immobile). Une étude histologique a été réalisée. Nous avons mis en évidence un mécanisme de glissement de la bourse subacromiale. Nous avons également constaté l'existence d'une insertion subcoracoïdienne de la capsule articulaire. Une connexion ligamentaire précoracoïdienne existait entre le tendon du chef long du m. biceps brachial et le lig. coraco-acromial. Nous avons dénommé cette structure “aponévrose coracoïdienne”, elle est concernée par les phénomènes de glissement de la capsule articulaire sous le processus coracoïde. Une des conséquences du mécanisme de glissement de la bourse séreuse subacromiale et de l'aponévrose coracoïdienne, que nous avons mis en évidence, est de remettre en cause nos conception des mouvements de l'épaule dans les régions subacromiale et subcoracoïdienne. Les techniques opératoires utilisées dans le traitement des conflits subcoracoïdien et subacromial doivent également être reconsidérées.
    Notes: Summary This anatomic study was devoted to the kinetics of the shoulder joint and especially the subacromial region. Following dissection of the shoulder joint capsule and subacromial region of 80 unpreserved shoulder joints, the anatomic relationships of the subacromial space in the neutral position and in continuous abduction (30°, 60° and 90° with fixed scapulae) were examined. These investigations were supplemented by histologic preparations. In the course of our examinations we discovered a gliding mechanism of the subacromial bursa. Moreover, we found a subcoracoid attachment of the shoulder joint capsule and a precoracoid ligamentous connection running between the short head of the biceps brachii m. and the coracoacromial ligament. We termed this the coracoid aponeurosis, which facilitates gliding behaviour of the shoulder joint capsule beneath the coracoid process. In view of this gliding mechanism of the subacromial bursa and the coracoid aponeurosis, discovered in the course of our investigations, we have to reassess the kinetics of the sub-acromial and subcoracoid space. Further, we should reconsider our operative technique in cases of the subacromial or subcoracoid impingement syndrome.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 133-137 
    ISSN: 1279-8517
    Keywords: Deep vein thrombosis ; Total hip replacement ; Femoral vein ; Posterior approach ; Lateral approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé L'étude anatomique a été réalisée pour établir la relation entre les différentes positions du membre inférieur au cours des arthroplasties totales de hanche et la survenue d'une thrombose veineuse profonde. Cette étude a été réalisée sur 18 cadavres, dont 32 vv. fémorales ont pu être examinées à différents temps de l'arthroplastie totale de hanche, avant et après ablation de la tête fémorale, par voie trans-glutéale ou par voie postérieure. Un endoscope (grand angle) a été introduit dans la v. fémorale par la v. iliaque externe. Le flux sanguin a été simulé par irrigation antérograde avec du sérum salé à travers la v. poplitée. Après l'ablation de la tête fémorale, il a été noté des différences significatives entre la voie d'abord trans-glutéale et la voie d'abord postérieure pour ce qui concerne l'aspect de la lumière de la v. fémorale et le flux sanguin. En ce qui concerne la voie trans-glutéale, ces modifications dépendaient du degré d'adduction et de la corpulence du cadavre. L'aspect de la lumière de la v. fémorale était initialement ovale, puis évoluait progressivement vers la sténose complète qui se situait à peu près entre 5 et 7,5 cm audessous du ligament inguinal. En adduction complète de la cuisse, la sténose se produisait, quelle que soit la corpulence du cadavre. En ce qui concerne la voie d'abord postérieure, la rotation médiale, indispensable à l'accès pour la mise en place de l'élément prothétique fémoral, causait une sténose de la v. fémorale dans 50% des cas. En ce qui concerne la combinaison des mouvements d'adduction et de flexion de la hanche, elle était responsable d'une sténose de la v. fémorale dans tous les cas, et ceci quelle que soit la corpulence du cadavre. Nos résultats indiquent que le durée de la position d'adduction de la cuisse durant l'arthroplastie totale de hanche par voie transglutéale devrait être diminuée car la réduction du flux sanguin dans la v. fémorale survient, même pour des petits degrés d'adduction. Dans la voie d'abord postérieure, la sténose survient plus tôt, elle ne dépend pas de la corpulence du cadavre.
    Notes: Summary An anatomic study was undertaken to establish whether positioning of the leg and surgical approaches for total hip replacement (THR) cause changes in the femoral v. which may contribute to the development of deep vein thrombosis (DVT). The patency of 32 femoral vv. of 18 cadavers was inspected at different levels during simulated THR. Before and after removal of the femoral head through a transgluteal or posterior approach, a wide-angle endoscope was inserted into the femoral v. via the external iliac v. Blood flow was simulated by proximal irrigation with saline through the popliteal v. After removal of the femoral head distinct changes were observed in both approaches. In the transgluteal approach the changes were dependent on the degree of adduction and the body build of the cadaver. Initially, an oval form was seen in a constricted lumen with an increasingly oblique oval deformation and a final facet-like closure, usually at about 5 to 7.5 cm below the inguinal ligament. In total adduction this stenosis occured regardless of build. Using a posterior approach, the necessary internal rotation caused a closure of the vein in 50% of cases. In combination with flexion and adduction there was stenosis in all cadavers regardless of body build. Our results indicate that the duration of the adducted position of the thigh during THR via a transgluteal approach should be minimised, as there is a reduction in blood flow with even minor degrees of adduction. In the posterior approach the stenosis occurs earlier, and is independent of the build of the cadaver.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 20 (1998), S. 41-45 
    ISSN: 1279-8517
    Keywords: Shoulder ; Kinetics ; Subacromial bursa ; Capsular ; Impingement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This anatomic study was devoted to the kinetics of the shoulder joint and especially the subacromial region. Following dissection of the shoulder joint capsule and subacromial region of 80 unpreserved shoulder joints, the anatomic relationships of the subacromial space in the neutral position and in continuous abduction (30°, 60° and 90° with fixed scapulae) were examined. These investigations were supplemented by histologic preparations. In the course of our examinations we discovered a gliding mechanism of the subacromial bursa. Moreover, we found a subcoracoid attachment of the shoulder joint capsule and a precoracoid ligamentous connection running between the short head of the biceps brachii m. and the coracoacromial ligament. We termed this the coracoid aponeurosis, which facilitates gliding behaviour of the shoulder joint capsule beneath the coracoid process. In view of this gliding mechanism of the subacromial bursa and the coracoid aponeurosis, discovered in the course of our investigations, we have to reassess the kinetics of the sub-acromial and subcoracoid space. Further, we should reconsider our operative technique in cases of the subacromial or subcoracoid impingement syndrome.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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