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  • 2000-2004  (2)
  • 1980-1984  (2)
  • 1925-1929
  • 1915-1919
  • MRI  (2)
  • Slow muscle fibres  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 40 (2000), S. 469-472 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Nutritialgefäßkanäle ; Os lunatum ; Lunatummalazie ; Ganglion ; Ulnaimpaktionssyndrom ; Key words Nutrient vessel canals ; Lunate bone ; MRI ; Kienböcks disease ; Ulna impaction syndrome ; Carpal ganglia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Purpose: To find and describe potential MRI criteria of nutrient vessel canals of carpal bones. Methods and Material: 16 wrists of 13 patients with pain and radiographic depiction of cystic changes within the lunate were examined. The MRI protocol included coronal and sagittal T1- and T2-weighted SE sequences (4 mm slices, 120 FOV, 256×256 matrix) as well as coronal STIR images. Final diagnosis was confirmed by surgery (n=5) and follow up. 10 cadaveric ossa lunata were studied to describe size, number, location and shape of nutrient vessel canals. Results: Ganglion cysts (n=6) showed characteristic signs. In ulnar impaction syndrome (n=1) small cystic lesions in the lunate were surrounded by a sclerotic rim and located near the proximal ulnar surface. In Kienböck’s disease (n=3) cystic components were irregular and surrounded by bone marrow edema. Nutrient vessel canals (n=7) imaged as 1 to 3 small cystic lesions within the palmar or dorsal subchondral region. Conclusion: MRI can aid in differential diagnosis of cystic carpal lesions. Nutrient vessel canals may not be mistaken for pathologic cystic lesions. Carpal ganglion cysts show distinct diagnostic pattern.
    Notes: Zusammenfassung Fragestellung: Sind karpale Nutritialgefäßkanäle auf MRI Bildern sichtbar und welche differentialdiagnostischen Kriterien lassen sich finden. Material und Methode: In 16 Fällen lagen bei 13 Patienten röntgenologisch wenige mm bis 2 cm große zystische Läsionen im Os lunatum vor. Das MRT-Protokoll umfaßte koronare und sagittale T1- und T2-gewichtete SE-Sequenzen mit 4 mm Schichtdicke, 120 mm Meßfeld und 2562 Matrix sowie koronare STIR-Sequenzen. Die Diagnosesicherung erfolgte durch Operation in 5 Fällen sowie Verlaufskontrollen. 10 mazerierte Ossa lunata wurden auf Form, Lokalisation, Anzahl und Größe der Nutritialgefäßkanäle untersucht. Ergebnisse: Ganglien (n=6) wiesen typische Zeichen auf. Im Falle eines Ulnaimpaktionssyndroms bei Ulna-Nullvariante wurden mehrere kleine zystische Läsionen im Os lunatum gefunden, umgeben von einem Sklerosesaum. Bei 3 Fällen einer frühen Lunatummalazie waren unregelmäßige zystische Komponenten von einem diffusen Ödem umgeben. In 7 Fällen mit sehr kleinen zystischen Defekten waren diese subchondral, palmar und dorsal gelegen und entsprachen aufgrund des klinischen Verlaufs und der Lokalisation Nutritialgefäßkanälen. Schlußfolgerung: Nutritialgefäßkanäle dürfen nicht mit pathologischen zystischen Prozessen des Os lunatums verwechselt werden. Mittels MRT können zystische Läsionen im und am Os lunatum weiter spezifiziert werden. Handgelenksganglien weisen typische MR-Zeichen auf.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 402 (1984), S. 88-93 
    ISSN: 1432-2013
    Keywords: Slow muscle fibres ; Denervation ; ACh-sensitivity ; Local electrical activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 1. The distribution of acetylcholine (ACh)-sensitive membrane areas was determined in 11–75 days denervated slow muscle fibres ofRana temporaria by iontophoretic application of acetylcholine. The fibres were also stimulated directly, and their electrical activity was recorded with an intra- and an extracellular electrode. 2. During the first two weeks following denervation the size of the ACh-sensitive fibre surface was similar to that of normal slow fibres, but a spreading out of ACh-sensitivity occurred between the 13th and 20th day. 3. The slow fibre membrane did not become homogeneously ACh-sensitive; even after long periods of denervation large local sensitivity gradients could be observed. Throughout the denervation period maximum values of ACh-sensitivity were in the same range as in normal slow fibres. 4. Action potentials were fully developed when ACh-sensitivity started to spread out. Extracellularly recorded inward currents varied in amplitude along the fibre surface, and either one or two peaks were observed in individual fibres. 5. The spatial relationship between inward current peaks and peaks of ACh-sensitivity was investigated in 12 fibres. Fifteen inward current peaks were located at distances of 30–640 μm from points of maximum ACh-sensitivity; only once did the centers of ACh-sensitivity and excitability coincide. 6. It is concluded that Na channels are incorporated into nonjunctional membrane areas of denervated slow fibres; this process preceds the incorporation of ACh-receptors by approximately one week.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 40 (2000), S. 688-693 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Knochenmark ; Physiologie ; Verteilungsmuster ; MRT ; Keywords Bone marrow ; Physiology ; Distribution pattern ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Physiology and age dependant changes of human bone marrow are described. The resulting normal distribution patterns of active and inactive bone marrow including the various contrasts on different MR-sequences are discussed.
    Notes: Zusammenfassung Die physiologischen, altersabhängigen Prozesse im Knochenmark des Menschen werden beschrieben. Die daraus resultierenden Verteilungsmuster zwischen hämatopoetisch aktivem und inaktivem Knochenmark werden dargestellt und die Bedeutung für die MR-tomographische Abbildbarkeit mittels der verschiedenen MR-Sequenzen erörtert.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 397 (1983), S. 300-305 
    ISSN: 1432-2013
    Keywords: Slow muscle fibres ; ACh ; Sensitivity ; Distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 1) The distribution of acetylcholine-sensitive membrane areas in slow muscle fibres of pyriformis muscles of Rana temporaria was examined by iontophoretic application of acetylcholine from high resistance pipettes. 2) ACh-sensitivity varied considerably along individual slow fibres and from fibre to fibre. In some fibres the sensitivity was restricted to segments of less than 100 μm, in others it was continuous over several millimeter. Segments of variable length, but up to several millimeter, were completely insensitive to acetylcholine. Highly sensitive spots (〉1,000 mV/nC) were found occasionally, their diameter being of the order of 10–20 μm only. The occurrence at rather regular intervals of ACh-sensitive areas was a rare observation; no evidence was found for a generalized ACh-sensitivity. 3) There were marked differences in the lengths of ACh-sensitive segments between surface fibres and fibres located in deeper layers of the muscles. 4) It is concluded that the ACh-sensitive membrane areas correspond to individual nerve muscle contacts of the small motor system whose spatial distribution is extremely variable. In superficial slow fibres the synaptic contacts seem to be located predominantly on the internal circumference of the fibres.
    Type of Medium: Electronic Resource
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