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Titolo:
Localization and contractile properties of intrinsic longitudinal motor units of the rat tongue
Autore:
Sokoloff, AJ;
Indirizzi:
Emory Univ, Sch Med, Dept Physiol, Atlanta, GA 30322 USA Emory Univ Atlanta GA USA 30322 Med, Dept Physiol, Atlanta, GA 30322 USA
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 2, volume: 84, anno: 2000,
pagine: 827 - 835
SICI:
0022-3077(200008)84:2<827:LACPOI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAL GASTROCNEMIUS-MUSCLE; HYPOGLOSSAL NEURAL ACTIVITY; OBSTRUCTIVE SLEEP-APNEA; HISTOCHEMICAL PROPERTIES; LATERAL GASTROCNEMIUS; MACACA-FASCICULARIS; TIBIALIS ANTERIOR; WHOLE-MUSCLE; AWAKE RAT; CAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Sokoloff, AJ Emory Univ, Sch Med, Dept Physiol, 1648 Pierce Dr, Atlanta, GA 30322 USA Emory Univ 1648 Pierce Dr Atlanta GA USA 30322 , GA 30322 USA
Citazione:
A.J. Sokoloff, "Localization and contractile properties of intrinsic longitudinal motor units of the rat tongue", J NEUROPHYS, 84(2), 2000, pp. 827-835

Abstract

Tongue dysfunction is a hallmark of many human clinical disorders, yet we lack even a rudimentary understanding of tongue neural control. Here, the location and contractile properties of intrinsic longitudinal motor units (MUs) of the rat tongue body are described to provide a foundation for developing and testing theories of tongue motor control. One hundred and sixty-five MUs were studied by microelectrode penetration and stimulation of individual motor axons coursing in the terminal portion of the lateral (retrusor)branch of the hypoglossal nerve in the rat. Uniaxial MU force was recordedby a transducer attached to the protruded tongue tip, and MU location was estimated by electromyographic (EMG) electrodes implanted into the anterior, middle, and posterior portions of the tongue body. All MUs produced retrusive force. MU twitch force ranged from 2-129 mg (mean = 35 mg) and tetanicforce ranged from 9-394 mg (mean = 95 mg). MUs reached maximal twitch force in 8-33 ms (mean = 15 ms) and were resistant to fatigue; following 2 min of stimulation, MUs (n = 11) produced 78-131% of initial force. EMG data were collected for 105 MUs. For 65 of these MUs, the EMG response was confined to a single electrode location: for 26 MUs to the anterior, 21 MUs to themiddle, and 18 MUs to the posterior portion of the tongue. Of the remaining MUs, EMG responses were observed in two (38/40) or all three (2/40) tongue regions. These data provide the first contractile measures of identified intrinsic tongue body MUs and the first evidence that intrinsic longitudinal MUs are restricted to a portion of tongue length. Localization of MU territory suggests a role for intrinsic MU in the regional control of the mammalian tongue observed during feeding and speech.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/01/20 alle ore 15:56:34