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Rate and extent of recovery from dark rearing in the visual cortex of the mouse

AuthorsValverde, Facundo
Issue Date1971
CitationBrain Research 33: 1- 11 (1971)
Abstract1. (1) A number of dendritic spines (those found before opening of eyes) in the apical dendrites of pyramidal cells of the visual cortex develop through the induction of morphogenetic agencies. The growing of these spines is not dependent on the presence or absence of visual stimuli. 2. (2) A second group of dendritic spines depends on normal arrival of visual impulses after the spontaneous opening of the eyes. 3. (3) If the animals are kept in darkness during the time of eye-lid opening the the second group of spines does not develop, and/or possibly a third group of spines grows in response to non-visual stimuli. The total number of spines will then never reach normal values. 4. (4) If the animals are removedfrom darkness after lid opening and are allowed to live under normal conditions, a permanent numerical loss in spines persists in some of the apical dendrites, while in others the number of spines reaches normal average values. 5. (5) The recovery of dendritic spines for some apical dendrites is noticeable two days after removal from darkness. © 1971.
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