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Titolo:
Development of hindlimb postural control during the first postnatal week in the rat
Autore:
Brocard, F; Vinay, L; Clarac, F;
Indirizzi:
CNRS, UPR Neurobiol & Mouvement, F-13402 Marseille 20, France CNRS Marseille France 20 obiol & Mouvement, F-13402 Marseille 20, France
Titolo Testata:
DEVELOPMENTAL BRAIN RESEARCH
fascicolo: 1, volume: 117, anno: 1999,
pagine: 81 - 89
SICI:
0165-3806(19991020)117:1<81:DOHPCD>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
LUMBAR SPINAL-CORD; NEONATAL RAT; NEWBORN RAT; MUSCLES; DIFFERENTIATION; LOCOMOTION; NEURONS; LIMB;
Keywords:
posture; development; vestibular system; gastrocnemius-soleus muscle; locomotion; descending pathways;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Vinay, L CNRS, UPR Neurobiol & Mouvement, UPR 9011,31 Chemin Joseph Aiguier, F-13402 Marseille 20, France CNRS UPR 9011,31 Chemin Joseph Aiguier Marseille France 20 rance
Citazione:
F. Brocard et al., "Development of hindlimb postural control during the first postnatal week in the rat", DEV BRAIN R, 117(1), 1999, pp. 81-89

Abstract

The development of the postural control of hindlimbs was investigated during the first postnatal week in the rat. The whole body was tilted in a vertical plane with the nose up. The proportion of animals producing a completeextension of both hindlimbs increased with age until the end of the first postnatal week. Motor responses were evoked by the pitch tilt already at birth with a slight extension of the hips, the knees and the ankles remainingbent in most cases. The extension produced at the ankle level increased gradually during the first postnatal week. This was correlated with a change in the EMG activity recorded from the triceps surae muscles (ankle extensors) during this postural reaction. There was a gradual acquisition of a tonic pattern. Characteristics of EMG responses changed significantly with age demonstrating an important increase in the use of triceps surae muscles in this postural task. These data demonstrate that the first postnatal week isa critical period for the development of postural reactions in the hindlimbs. They also suggest the existence of a proximo-distal gradient in the maturation of postural control. The mechanisms responsible for this reflex andfor the maturation of posture are discussed. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 20:29:13