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December 1952

ASCENDING FIBERS IN PYRAMIDAL TRACT OF CAT

Author Affiliations

OSLO, NORWAY

From the Anatomical Institute, University of Oslo.

AMA Arch NeurPsych. 1952;68(6):755-775. doi:10.1001/archneurpsyc.1952.02320240030003
Abstract

IN THE neurological literature of recent years much debate has been devoted to the pyramidal tract. Publications from the fields of anatomy, physiology, and clinical neurology have contributed greatly to improve the understanding of this nerve pathway and its function, but there are still deplorable gaps in knowledge of this tract. One of these gaps concerns the question of the exact origin of the fibers of the pyramidal tract.1

Häggqvist2 and Lassek3 have shown that removal of Area 4 of the cerebral cortex in monkeys leaves intact a considerable proportion of fibers in the medullary pyramid, and that consequently the origin of the pyramidal fibers must be more widespread. Contributions to the tract from the parietal cortex have been demonstrated, and from the premotor cortex by some authors (cited by Lassek and Evans4 and Tower5), but even after precentral and extensive parietal ablations more than

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