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Corticospinal Function and Voluntary Movement$
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Robert Porter and Roger Lemon

Print publication date: 1995

Print ISBN-13: 9780198523758

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780198523758.001.0001

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Anatomical substrates for movement performance: cerebral cortex and the corticospinal tract

Anatomical substrates for movement performance: cerebral cortex and the corticospinal tract

Chapter:
(p.36) 2 Anatomical substrates for movement performance: cerebral cortex and the corticospinal tract
Source:
Corticospinal Function and Voluntary Movement
Author(s):

Robert Porter

Roger Lemon

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198523758.003.0002

Although the function of a particular cortical area is determined not so much by its intrinsic structure as by its extrinsic connections, its inputs and outputs, it is important to review the intrinsic structure of the motor cortex with which these inputs, and the determinants of its functions, must interact. Intrinsic networks are available for selection by different inputs and are utilized in the organization of cortical outputs to the multiple sites which receive these projections. This chapter concentrates on the features of the motor cortex which distinguish it from other cortical areas. It describes in detail the sources of the inputs which operate on its intrinsic networks and gives special attention to the organization of its corticofugal outputs. In hierarchical models of mammalian motor systems, the motor cortex, and in particular its corticospinal output, are seen as executive structures. Nevertheless, it is now abundantly clear that the motor cortex is not independent and self-sufficient in these executive functions: it is itself under the influence of a large variety of different inputs, including some originating in the periphery.

Keywords:   anatomical substrates, intrinsic structure, motor cortex, movement performance, mammalian motor systems, corticospinal output

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