Navegando por Palavras-chave "nerve fibers"

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    A brief historical note on the classification of nerve fibers
    (Academia Brasileira de Neurologia - ABNEURO, 2008-03-01) Manzano, Gilberto Mastrocola [UNIFESP]; Giuliano, Lydia M.p. [UNIFESP]; Nóbrega, João Antonio Maciel [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    This is a brief review of the literature focused on the articles that formed the basis for the classification of the nerve fibers. Mention is also made to the origin of the nomenclature of the different motoneurons (a, b and g).
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    Impact of pregnancy and childbirth on female rats' urethral nerve fibers
    (Springer, 2007-12-01) Rocha, M. A.; Sartori, M. G. F.; Simoes, M. De Jesus; Herrmann, V.; Baracat, E. C.; Lima, G. Rodrigues de; Girao, M. J. B. C.; Universidade Federal de São Paulo (UNIFESP); Universidade Estadual de Campinas (UNICAMP)
    This study aims to evaluate the urethral nerve fibers of adult female rats during pregnancy and after vaginal birth, cesarean section or simulated birth trauma. for immunohistochemical analysis of nerve fibers, 70 female rats were distributed in seven groups of ten female rats: group 1, control; group 2, pregnant; group 3, cesarean section; group 4, vaginal birth; group 5, virgin female rats with simulated birth trauma; group 6, cesarean section followed by simulation of birth trauma; and group 7, vaginal birth followed by simulation of birth trauma. the number of nerve fibers in groups 1, 2, and 3 were significantly higher than the other groups. Pregnancy and cesarean section did not cause alterations in the nerve fibers number. Vaginal birth and simulated birth trauma significantly decreased the number of nerve fibers in the female rats' middle urethra.
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    Ultrastructure of Motor Nerve Terminals in the Anterior Third of Wistar Rat Tongue
    (Wiley-Blackwell, 2009-06-01) Motoyama, Aracy A.; Watanabe, Ii-Sei; Iyomasa, Mamie M.; Silva, Marcelo C. P. [UNIFESP]; Sosthines, Marcia C. K.; Lopes, Marilia Gabriela O.; Guimaraes, J. P.; Kfoury, Jose R.; Universidade de São Paulo (USP); Universidade Federal de São Paulo (UNIFESP); Fed Univ Para; Univ Vale Paraiba
    The nerve terminals of intrinsic muscular fibers of the tongue of adult wistar rats was studied by using silver impregnation techniques, transmission electron microscopy (TEM), and high resolution scanning electron microscopy (HRSEM) to observe the nerve fibers and their terminals. Silver impregnation was done according to Winkelman and Schmit, 1957. for TEM, small blocks were fixed in modified Karnovsky solution, postfixed in 1% buffered osmium tetroxide solution, and embedded in Spurr resin. for HRSEM, the parts were fixed in 2% osmium tetroxide solution with 1/15 M sodium phosphate buffer (pH 7.4) at 4 degrees C for 2 h, according to the technique described by Tanaka, 1989. Thick myelinated nerve bundles were histologically observed among the muscular fibers. the intrafusal nerve fiber presented a tortuous pathway with punctiform terminal axons in clusters contacting the surface of sarcolemma. Several myelinated nerve fibers involved by collagen fibers of the endoneurium were observed in HRSEM in three-dimensional aspects. the concentric lamellae of the myelin sheath and the axoplasm containing neurofilaments interspersed among the mitochondria were also noted. in TEM, myofibrils, mitochondria, rough endoplasmic reticulum, Golgi's apparatus, and glycogen granules were observed in sarcoplasm. It is also noted that the sarcomeres constituted by myofilaments with their A, I, and H bands and the electron dense Z lines. in areas adjacent to muscular fibers, there were myelinated and unmyelinated nerve fibers involved by endoneurium and perineurium. in the region of the neuromuscular junction, the contact with the sarcolemma of the muscular cell occurs forming several terminal buttons and showing numerous evaginations of the cell membrane. in the terminal button, mitochondria and numerous synaptic vesicles were observed. Microsc. Res. Tech. 72:464-470, 2009. (C) 2009 Wiley-Liss. Inc.