Abstract
AbstractAnatomical studies on the organization of the visual system of Eugeres plumieri have been initiated with an analysis of the distribution of retinal fibers in the brain. Twelve adult specimens were unilaterally enucleated. After postoperative survival periods ranging from six to 30 days, the fishes were perfused and the brains processed according to several modifications of the Nauta technique for the demonstration of degenerating axons and terminals (Ebbesson, '70). Although some terminal degeneration can be seen as early as six days, the degenerating fibers and terminals are best demonstrated in specimens with post‐operative survivals of 15 days or longer.The optic tract is entirely crossed and issues fascicles to the hypothalamus, nucleus geniculatus lateralis, nucleus opticus dorsolateralis thalami, nuclei pretectales, nucleus corticalis, and tectum opticum. The nucleus geniculatus lateralis is unusually large and well laminated, as is the optic tectum. The retinal input to the latter is distributed to, and terminates in, the stratum opticum and the highly differentiated stratum griseum et fibrosum superficiale. Debris of degeneration was also consistently seen in the stratum album centrale.
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