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• W2017649853 abstract "The proximal stump of a transected mandibular nerve was grafted onto the rostrodorsal surface of the optic tectum in adult Rana pipiens to investigate the morphologic characteristics of nonspecific axonal regeneration in a highly organized region of central nervous system (CNS). Within the first 3 weeks postgraft surgery (WPS), the nerve-tectum interface became firmly established. Concomitant with this was an invasion of the host tectum by a small number of fine “pioneerlike” axons from the nerve. By 6 WPS there developed a concerted instreaming of a large number of peripheral fibers. Once within the CNS, the foreign axons distributed themselves throughout the rostrocaudal extent of the tectum, but primarily its dorsal aspect within superficial layers 8 and 9. Presence of intact optic fibers at the time of mandibular fiber invasion served somewhat to restrict the regenerating aberrant axons in their course through layer 9. This restriction could be avoided by removal of the optic input either before or during peripheral ingrowth. However, once peripheral fibers had entered and established themselves in the host environment, no subsequent manipulation of the retinotectal projection had any effect. The aberrant growth pattern, which appeared remarkably stable after 6 WPS, consisted of a plexus of medium- and fine-caliber peripheral axons. Many of these fibers had numerous branches and “en passant” varicosities, the latter encompassing a variety of shapes and sizes. Terminal swellings and arborizations were also found. When comparing the regeneration of optic and mandibular nerve fibers in the tectum, two distinctions were made. Whereas optic axons revealed a fascicular and layered organization, mandibular axons showed a highly segregated and disordered growth pattern. These characteristic differences were maintained even when the two fiber systems were allowed to coregenerate into the same target tectum. Thus, each of the two groups of axons interacts with the tectal substrate in a distinct manner, apparently independent of the other." @default.
• W2017649853 created "2016-06-24" @default.
• W2017649853 creator A5023463565 @default.
• W2017649853 creator A5070309473 @default.
• W2017649853 date "1985-05-15" @default.
• W2017649853 modified "2023-09-23" @default.
• W2017649853 title "Peripheral nerve grafts to the frog optic tectum: A morphological study of foreign axon regeneration in the central nervous system" @default.
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• W2017649853 doi "https://doi.org/10.1002/cne.902350310" @default.
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