Read e-book online Comparative Neurology of the Telencephalon PDF

By Sven O. E. Ebbesson (auth.), Sven O. E. Ebbesson (eds.)

ISBN-10: 1461329884

ISBN-13: 9781461329886

ISBN-10: 1461329906

ISBN-13: 9781461329909

When a tender graduate scholar sat sooner than Percival Bailey in 1960 and said his longstanding curiosity in zoology and his fresh curiosity within the fearful approach, he requested the then Director of the Illinois Neuropsychiatric Institute if there has been help within the clinical institution for study in evolutionary comparative neurology. Bailey patted his stomach with either fingers and concept for a second. eventually he stated: "Young guy, there is not any position for individuals like you." The graduate scholar was once crestfallen. To a wide quantity what Bailey acknowledged remains to be actual. The higher a part of study in neurobiology is directed towards answering a unmarried extensive query. How do brains typically, and the human mind particularly, paintings? this can be a valid and demanding query. it isn't, even if, the one query worthy answering. This overweening emphasis on functionality, specially in regard to the human apprehensive is end result of the the origins of neurology within the hospital. the pro university, method, web site of so much such study, has been remarkably well-insulated from some of the significant matters of biology.

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Extra resources for Comparative Neurology of the Telencephalon

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In an experiment involving some 50 sharks and telencephalic lesions of various sizes and locations (Ebbesson and Schroeder, 1971), connections with both epithalamic and hypothalamic centers, as shown by earlier workers, were found, but in addition massive connections with thalamus, optic tectum, and select neuronal aggregates at every level of the brainstem were discovered (Fig. 8). Since telencephalic projections to such levels in mammals originate predominantly in the cerebral cortex, we have reached the tentative conclusion that some of the telencephalic efferents in elasmobranchs represent pathways homologous to mammalian cortico-thalamic and cortico-bulbar pathways.

The origin of this pathway is still unknown. Perhaps the most unexpected finding was the evidence for a major, principally crossed thalamo-telencephalic pathway. So far, the only other vertebrate form in which any contralateral thalamo-telencephalic connections have been observed is the owl (H. J. Karten and W. J. H. Nauta, personal communication). However, in that avian species, no more than approximately 25% of the thalamic efferents decussate, while in the nurse shark all thalamo-telencephalic fibers appear to cross with the exception of sporadic fibers in the ipsilateral tractus pallii.

To this end, unilateral lesions were made in the diencephalon in a large sample of nurse sharks (Ebbesson and Shroeder, 1971; Schroeder and Ebbesson, 1974). In all cases of sharks with lesions in the dorsal thalamus, degenerating fibers could be traced to two well-defined cell aggregates in the contralateral half of the telencephalon and to a ventral telencephalic structure bilaterally (Fig. 6). The latter projection was found degenerating also in cases of lesions candal to the diencephalon. The origin of this pathway is still unknown.

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Comparative Neurology of the Telencephalon by Sven O. E. Ebbesson (auth.), Sven O. E. Ebbesson (eds.)


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