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November 1957

Terminal Distribution of Spinoreticular Fibers in the Cat

Author Affiliations

Pisa, Italy; Oslo, Norway

From the Anatomical Institute, University of Oslo.

AMA Arch NeurPsych. 1957;78(5):439-453. doi:10.1001/archneurpsyc.1957.02330410003001

Fibers ascending in the spinal cord and terminating in the reticular formation of the brain stem were demonstrated around the turn of the century in experimental animals,22,23,30,31,40 as well as in man.15,37 After the discovery of the ascending reticular activating system by Moruzzi and Magoun,29 renewed attention was directed to the pathways mediating spinal impulses to the reticular formation, and recent experimental anatomical investigations6,20,21, 26-28 have confirmed and extended the findings made in studies with the Marchi method by the classical workers.

In a previous study12 we have shown that long ascending fibers, passing beyond the mesencephalon, take origin particularly from certain regions of the brain stem reticular formation. From a functional point of view it would be of interest to know whether these regions receive the majority of the spinoreticular fibers. The studies of the spinoreticular fibers found in the literature indicate that this