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- W2088807746 abstract "The development and aging of the nucleolus and nucleus in layer V pyramidal cells in the hamster cerebrum were studied by light and electron microscopy. The nucleoli appeared in the newborn as occasional fibrillar masses adjacent to peripherally placed bodies of chromatin. By maturity, a single, generally central, nucleolus proper with nucleolus-associated chromatin was present. Nucleolar microbodies were observed at 10, 15, 20 and 480 days, but not in the newborn, 5-or 90-day animal. An intranucleolar body was not observed at the electron at the electron-microscopy level in these pyramidal cell nucleoli at any age in this series, in contrast to the situation in large motor neurons of the facial nucleus. The nucleus progressed from an irregular shape at birth to an oval shape at maturity. At 10 days, incipient invaginations of the nuclear membrane appeared; these subsequently increased in depth and frequency in the adult. The above changes, particularly in the nucleoli, are correlated in time with changes involving the endoplasmic reticulum. The correlations may indicate different periods of metabolic activity in the hamster pyramidal neurons. Four such periods can be differentiated on the basis of cytomorphic changes which may be correlated to reported development of function. The sequence of these changes, peculiar to the developing and aging hamster pyramidal neuron, differs from that seen in large spinal and cranial motor neurons. It appears that some features of nuclear immaturity, which are lost in larger neuronal types, are retained in the adult pyramidal neuron." @default.
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- W2088807746 date "1981-04-01" @default.
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- W2088807746 title "Morphological changes of the pyramidal cell nucleolus and nucleus in hamster frontal cortex during develoment and aging" @default.
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- W2088807746 doi "https://doi.org/10.1016/0047-6374(81)90043-9" @default.
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