Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
RECRUITMENT OF RETICULOSPINAL NEURONS AND STEADY LOCOMOTION IN LAMPREY
Autore:
WANNIER T; SENN W;
Indirizzi:
UNIV BERN,INST PHYSIOL,BUHLPL 5 CH-3012 BERN SWITZERLAND UNIV BERN,INST INFORMAT & ANGEW MATH BERN SWITZERLAND
Titolo Testata:
Neural networks
fascicolo: 6, volume: 11, anno: 1998,
pagine: 1005 - 1015
SICI:
0893-6080(1998)11:6<1005:RORNAS>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
FICTIVE LOCOMOTION; SPINAL-CORD; PHASIC MODULATION; PROJECTIONS; AXONS; TRANSMISSION; NMDA;
Keywords:
CONDUCTION VELOCITY; LAMPREY; LOCOMOTION; MOTOR CONTROL; RETICULOSPINAL SYSTEM; SIZE PRINCIPLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
CompuMath Citation Index
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
T. Wannier e W. Senn, "RECRUITMENT OF RETICULOSPINAL NEURONS AND STEADY LOCOMOTION IN LAMPREY", Neural networks, 11(6), 1998, pp. 1005-1015

Abstract

In lamprey, the supraspinal control of velocity is mainly accomplished by the reticulospinal (RS) system. During locomotion, RS neurones are rhythmically active with a cycle duration corresponding to the duration of the swim cycle. While the velocity of the muscular contraction wave changes as swimming velocity changes, the conduction velocity of RS axons remains constant. Thus, an action potential generated during a specific phase of the swim cycle will, depending on swimming velocity, provide input to a particular downstream segment during different phases of its rhythmic activity. In order to investigate the importanceof this effect for the control of locomotion, the temporal and spatial characteristics of the propagation of the population of action potentials along RS axons in the spinal cord were investigated. The resultssuggest that if RS neurones are recruited independently of their sizes and conduction velocities, a phasic wave of action potentials in these fibers will reach some segments during the inhibited phase of theirrhythmic activity. Such an input could hinder a smooth propagation ofthe contraction wave and disrupt swimming. In contrast, by recruitingsuccessively larger and hence more rapidly conducting neurones for successively more rapid swimming, the phasic wave of action potentials may propagate with the same velocity as that of the muscular contraction wave. Under such conditions, reticulospinal activity would support and stabilise locomotion. (C) 1998 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:36:32