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• W2045548034 startingPage "291" @default.
• W2045548034 abstract "A morphometric analysis of postnatal differentiation in the rat trochlear nerve was studied by light and electron microscopy as an initial basis for understanding motor unit heterogeneity in the extraocular muscles (EOM). A total of 35 animals were examined 7–90 days postnatal (dpn). The mean number of fibers increased from 222 at 7 dpn to 274 in the adult and the size distribution became bimodal at 21 dpn. In the adult 17% of the myelinated fibers had a mean diameter of 2.5 μm and 83% were 7.3 μm. The estimated number of unmyelinated axons decreased from about 40% at 7 dpn to 20% at 14 dpn and 16% in the adult. The myelinated fiber diameter was more highly correlated with age and body weight than was fiber number. Certain organelles characteristic of active membrane growth were present in the Schwann cell cytoplasm at the paranode region. Redundant loops were prominent at 10 dpn, when many axons were still in Schwann cell bundles. During the third postnatal week a number of alterations were noted which may reflect a loss of polyneuronal innervation. These included thicker myelin sheaths and ultrastructural evidence of axonal degeneration. Branching of myelinated fibers was limited to the intramuscular portions of the nerve at 18 dpn. The g-ratio of the largest fibers at selected ages was nearly constant at .71 and was correlated with fiber diameter (r = 0.40), except at 14 dpn. The periodicity of the myelin sheath had either an inverse or constant relationship to the number of lamellae. The significance of the results is discussed in relation to postnatal development, the size principle and heterogeneity in the EOM motor units." @default.
• W2045548034 created "2016-06-24" @default.
• W2045548034 creator A5039524414 @default.
• W2045548034 date "1980-01-15" @default.
• W2045548034 modified "2023-10-16" @default.
• W2045548034 title "Postnatal differentiation of the rat trochlear nerve" @default.
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• W2045548034 doi "https://doi.org/10.1002/cne.901890206" @default.
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